diff --git a/doc/images/qmldesigner-new-project.png b/doc/images/qmldesigner-new-project.png
index bd6679aa08a..a5c34a42790 100644
Binary files a/doc/images/qmldesigner-new-project.png and b/doc/images/qmldesigner-new-project.png differ
diff --git a/doc/src/howto/creator-only/creator-external-tools.qdoc b/doc/src/howto/creator-only/creator-external-tools.qdoc
index a5038a65918..546efaf72a3 100644
--- a/doc/src/howto/creator-only/creator-external-tools.qdoc
+++ b/doc/src/howto/creator-only/creator-external-tools.qdoc
@@ -52,7 +52,11 @@
     code and translations. The lrelease tool is used to create run-time
     translation files for use by the released application.
 
-    To synchronize translation source (TS) files from a translator with the
+    When you \l{Creating Projects}{create a new project}, you can automatically
+    generate a translation source file (TS) for one language. You can add other
+    languages later by editing the project file.
+
+    To synchronize TS files from a translator with the
     application code, select \uicontrol Tools > \uicontrol External >
     \uicontrol Linguist > \uicontrol {Update Translations (lupdate)}.
 
diff --git a/doc/src/overview/creator-only/creator-mobile-targets.qdoc b/doc/src/overview/creator-only/creator-mobile-targets.qdoc
index 4c5ff795a3a..37822c534fd 100644
--- a/doc/src/overview/creator-only/creator-mobile-targets.qdoc
+++ b/doc/src/overview/creator-only/creator-mobile-targets.qdoc
@@ -104,8 +104,8 @@
             applications in WebAssembly format, to deploy them, and to
             run them in a web browser.
 
-        \li \l{http://doc.qt.io/qtcreator/creator-overview-qtasam.html}
-            {Qt Application Manager}
+        \li \l{https://doc.qt.io/qtcreator/creator-overview-qtasam.html}
+            {Qt Creator Plugin for Qt Application Manager}
 
             You can use the experimental Qt Application Manager plugin
             (commercial only) to deploy, run, and debug applications on the
diff --git a/doc/src/qtquick/creator-only/qtquick-creating.qdoc b/doc/src/qtquick/creator-only/qtquick-creating.qdoc
index 560d3a7671c..d37992ed2ee 100644
--- a/doc/src/qtquick/creator-only/qtquick-creating.qdoc
+++ b/doc/src/qtquick/creator-only/qtquick-creating.qdoc
@@ -128,6 +128,16 @@
 
         \li Select \uicontrol Next.
 
+        \li In the \uicontrol Language field, select a language that you plan
+            to \l {Using Qt Linguist}{translate} the application to. You can
+            add other languages later by editing the project file.
+
+        \li In the \uicontrol {Translation file} field, you can edit the
+            name for the translation source file that will be generated
+            for the selected language.
+
+        \li Select \uicontrol Next.
+
         \li Select \l{glossary-buildandrun-kit}{kits} for running and building
             your project, and then click \uicontrol Next.
 
diff --git a/doc/src/qtquick/qtquick-properties.qdoc b/doc/src/qtquick/qtquick-properties.qdoc
index 4218edb04af..add17138c4f 100644
--- a/doc/src/qtquick/qtquick-properties.qdoc
+++ b/doc/src/qtquick/qtquick-properties.qdoc
@@ -181,6 +181,12 @@
     For more information, see
     \l {Internationalization and Localization with Qt Quick}.
 
+    \if defined(qtcreator)
+    When you \l{Creating Qt Quick Projects}{create a new project}, you can
+    automatically generate a translation source file (TS) for one language.
+    You can add other languages later by editing the project file.
+    \endif
+
     \section1 Loading Placeholder Data
 
     The Design mode supports views, models, and delegates, so that when you add
diff --git a/src/plugins/CMakeLists.txt b/src/plugins/CMakeLists.txt
index db1a5b5e2aa..d1eae35d24a 100644
--- a/src/plugins/CMakeLists.txt
+++ b/src/plugins/CMakeLists.txt
@@ -52,7 +52,6 @@ add_subdirectory(genericprojectmanager)
 add_subdirectory(git)
 add_subdirectory(mercurial)
 add_subdirectory(perforce)
-add_subdirectory(python)
 add_subdirectory(qmakeprojectmanager)
 add_subdirectory(qmljstools)
 add_subdirectory(qmlprojectmanager)
@@ -70,6 +69,7 @@ add_subdirectory(baremetal)
 add_subdirectory(clangcodemodel)
 add_subdirectory(clangtools)
 add_subdirectory(ios)
+add_subdirectory(python)
 add_subdirectory(qmljseditor)
 add_subdirectory(qmlpreview)
 add_subdirectory(qmlprofiler)
diff --git a/src/plugins/debugger/debuggercore.h b/src/plugins/debugger/debuggercore.h
index 60bd22f3731..af0de1c25b9 100644
--- a/src/plugins/debugger/debuggercore.h
+++ b/src/plugins/debugger/debuggercore.h
@@ -36,7 +36,6 @@
 #include <functional>
 
 QT_BEGIN_NAMESPACE
-class QMessageBox;
 class QWidget;
 class QMenu;
 class QAction;
@@ -50,9 +49,6 @@ class SavedAction;
 namespace Debugger {
 namespace Internal {
 
-class Console;
-class Symbol;
-class Section;
 class GlobalDebuggerOptions;
 
 enum TestCases
@@ -64,23 +60,16 @@ enum TestCases
 // Some convenience.
 void openTextEditor(const QString &titlePattern, const QString &contents);
 
-void showModuleSymbols(const QString &moduleName, const QVector<Internal::Symbol> &symbols);
-void showModuleSections(const QString &moduleName, const QVector<Internal::Section> &sections);
-
 QSharedPointer<Internal::GlobalDebuggerOptions> globalDebuggerOptions();
 
 bool isTestRun();
 
 Utils::SavedAction *action(int code);
-Console *console();
 
 bool boolSetting(int code);
 QString stringSetting(int code);
 QStringList stringListSetting(int code);
 
-QMessageBox *showMessageBox(int icon, const QString &title,
-    const QString &text, int buttons = 0);
-
 QAction *addAction(QMenu *menu, const QString &display, bool on,
                    const std::function<void()> &onTriggered = {});
 QAction *addAction(QMenu *menu, const QString &d1, const QString &d2, bool on,
diff --git a/src/plugins/debugger/debuggerengine.cpp b/src/plugins/debugger/debuggerengine.cpp
index 0dd02e1b63f..9d59cc0fe07 100644
--- a/src/plugins/debugger/debuggerengine.cpp
+++ b/src/plugins/debugger/debuggerengine.cpp
@@ -2619,6 +2619,73 @@ QString DebuggerEngine::formatStartParameters() const
     return rc;
 }
 
+static void createNewDock(QWidget *widget)
+{
+    auto dockWidget = new QDockWidget;
+    dockWidget->setWidget(widget);
+    dockWidget->setWindowTitle(widget->windowTitle());
+    dockWidget->setFeatures(QDockWidget::DockWidgetClosable);
+    dockWidget->show();
+}
+
+void DebuggerEngine::showModuleSymbols(const QString &moduleName, const Symbols &symbols)
+{
+    auto w = new QTreeWidget;
+    w->setUniformRowHeights(true);
+    w->setColumnCount(5);
+    w->setRootIsDecorated(false);
+    w->setAlternatingRowColors(true);
+    w->setSortingEnabled(true);
+    w->setObjectName("Symbols." + moduleName);
+    QStringList header;
+    header.append(tr("Symbol"));
+    header.append(tr("Address"));
+    header.append(tr("Code"));
+    header.append(tr("Section"));
+    header.append(tr("Name"));
+    w->setHeaderLabels(header);
+    w->setWindowTitle(tr("Symbols in \"%1\"").arg(moduleName));
+    for (const Symbol &s : symbols) {
+        auto it = new QTreeWidgetItem;
+        it->setData(0, Qt::DisplayRole, s.name);
+        it->setData(1, Qt::DisplayRole, s.address);
+        it->setData(2, Qt::DisplayRole, s.state);
+        it->setData(3, Qt::DisplayRole, s.section);
+        it->setData(4, Qt::DisplayRole, s.demangled);
+        w->addTopLevelItem(it);
+    }
+    createNewDock(w);
+}
+
+void DebuggerEngine::showModuleSections(const QString &moduleName, const Sections &sections)
+{
+    auto w = new QTreeWidget;
+    w->setUniformRowHeights(true);
+    w->setColumnCount(5);
+    w->setRootIsDecorated(false);
+    w->setAlternatingRowColors(true);
+    w->setSortingEnabled(true);
+    w->setObjectName("Sections." + moduleName);
+    QStringList header;
+    header.append(tr("Name"));
+    header.append(tr("From"));
+    header.append(tr("To"));
+    header.append(tr("Address"));
+    header.append(tr("Flags"));
+    w->setHeaderLabels(header);
+    w->setWindowTitle(tr("Sections in \"%1\"").arg(moduleName));
+    for (const Section &s : sections) {
+        auto it = new QTreeWidgetItem;
+        it->setData(0, Qt::DisplayRole, s.name);
+        it->setData(1, Qt::DisplayRole, s.from);
+        it->setData(2, Qt::DisplayRole, s.to);
+        it->setData(3, Qt::DisplayRole, s.address);
+        it->setData(4, Qt::DisplayRole, s.flags);
+        w->addTopLevelItem(it);
+    }
+    createNewDock(w);
+}
+
 // CppDebuggerEngine
 
 Context CppDebuggerEngine::languageContext() const
diff --git a/src/plugins/debugger/debuggerengine.h b/src/plugins/debugger/debuggerengine.h
index f4ba9e47cb0..32c8e7481b5 100644
--- a/src/plugins/debugger/debuggerengine.h
+++ b/src/plugins/debugger/debuggerengine.h
@@ -102,9 +102,11 @@ class LogWindow;
 class ModulesHandler;
 class RegisterHandler;
 class PeripheralRegisterHandler;
-class StackHandler;
-class StackFrame;
+class Section;
 class SourceFilesHandler;
+class StackFrame;
+class StackHandler;
+class Symbol;
 class WatchHandler;
 class WatchTreeView;
 class DebuggerToolTipContext;
@@ -460,6 +462,9 @@ public:
 
     void openMemoryEditor();
 
+    static void showModuleSymbols(const QString &moduleName, const QVector<Symbol> &symbols);
+    static void showModuleSections(const QString &moduleName, const QVector<Section> &sections);
+
     void handleExecDetach();
     void handleExecContinue();
     void handleExecInterrupt();
@@ -546,7 +551,6 @@ protected:
     bool isNativeMixedActiveFrame() const;
     void startDying() const;
 
-protected:
     ProjectExplorer::IDevice::ConstPtr device() const;
     DebuggerEngine *companionEngine() const;
 
diff --git a/src/plugins/debugger/debuggerplugin.cpp b/src/plugins/debugger/debuggerplugin.cpp
index 0bf371835d3..50ac0504a7d 100644
--- a/src/plugins/debugger/debuggerplugin.cpp
+++ b/src/plugins/debugger/debuggerplugin.cpp
@@ -2015,15 +2015,6 @@ void DebuggerPluginPrivate::aboutToShutdown()
     m_shutdownTimer.start();
 }
 
-static void createNewDock(QWidget *widget)
-{
-    auto dockWidget = new QDockWidget;
-    dockWidget->setWidget(widget);
-    dockWidget->setWindowTitle(widget->windowTitle());
-    dockWidget->setFeatures(QDockWidget::DockWidgetClosable);
-    dockWidget->show();
-}
-
 void DebuggerPluginPrivate::remoteCommand(const QStringList &options)
 {
     if (options.isEmpty())
@@ -2038,17 +2029,6 @@ void DebuggerPluginPrivate::remoteCommand(const QStringList &options)
     runScheduled();
 }
 
-QMessageBox *showMessageBox(int icon, const QString &title, const QString &text, int buttons)
-{
-    QMessageBox *mb = new QMessageBox(QMessageBox::Icon(icon),
-        title, text, QMessageBox::StandardButtons(buttons),
-        ICore::mainWindow());
-    mb->setAttribute(Qt::WA_DeleteOnClose);
-    mb->setTextInteractionFlags(Qt::TextSelectableByMouse);
-    mb->show();
-    return mb;
-}
-
 void addDebugInfoTask(unsigned id, const QString &cmd)
 {
     dd->m_debugInfoTaskHandler.addTask(id, cmd);
@@ -2117,64 +2097,6 @@ QStringList stringListSetting(int code)
     return action(code)->value().toStringList();
 }
 
-void showModuleSymbols(const QString &moduleName, const Symbols &symbols)
-{
-    auto w = new QTreeWidget;
-    w->setUniformRowHeights(true);
-    w->setColumnCount(5);
-    w->setRootIsDecorated(false);
-    w->setAlternatingRowColors(true);
-    w->setSortingEnabled(true);
-    w->setObjectName("Symbols." + moduleName);
-    QStringList header;
-    header.append(DebuggerPlugin::tr("Symbol"));
-    header.append(DebuggerPlugin::tr("Address"));
-    header.append(DebuggerPlugin::tr("Code"));
-    header.append(DebuggerPlugin::tr("Section"));
-    header.append(DebuggerPlugin::tr("Name"));
-    w->setHeaderLabels(header);
-    w->setWindowTitle(DebuggerPlugin::tr("Symbols in \"%1\"").arg(moduleName));
-    for (const Symbol &s : symbols) {
-        auto it = new QTreeWidgetItem;
-        it->setData(0, Qt::DisplayRole, s.name);
-        it->setData(1, Qt::DisplayRole, s.address);
-        it->setData(2, Qt::DisplayRole, s.state);
-        it->setData(3, Qt::DisplayRole, s.section);
-        it->setData(4, Qt::DisplayRole, s.demangled);
-        w->addTopLevelItem(it);
-    }
-    createNewDock(w);
-}
-
-void showModuleSections(const QString &moduleName, const Sections &sections)
-{
-    auto w = new QTreeWidget;
-    w->setUniformRowHeights(true);
-    w->setColumnCount(5);
-    w->setRootIsDecorated(false);
-    w->setAlternatingRowColors(true);
-    w->setSortingEnabled(true);
-    w->setObjectName("Sections." + moduleName);
-    QStringList header;
-    header.append(DebuggerPlugin::tr("Name"));
-    header.append(DebuggerPlugin::tr("From"));
-    header.append(DebuggerPlugin::tr("To"));
-    header.append(DebuggerPlugin::tr("Address"));
-    header.append(DebuggerPlugin::tr("Flags"));
-    w->setHeaderLabels(header);
-    w->setWindowTitle(DebuggerPlugin::tr("Sections in \"%1\"").arg(moduleName));
-    for (const Section &s : sections) {
-        auto it = new QTreeWidgetItem;
-        it->setData(0, Qt::DisplayRole, s.name);
-        it->setData(1, Qt::DisplayRole, s.from);
-        it->setData(2, Qt::DisplayRole, s.to);
-        it->setData(3, Qt::DisplayRole, s.address);
-        it->setData(4, Qt::DisplayRole, s.flags);
-        w->addTopLevelItem(it);
-    }
-    createNewDock(w);
-}
-
 void openTextEditor(const QString &titlePattern0, const QString &contents)
 {
     if (dd->m_shuttingDown)
diff --git a/src/plugins/debugger/gdb/gdbengine.cpp b/src/plugins/debugger/gdb/gdbengine.cpp
index 5a40aa2ee0c..ff0197c2250 100644
--- a/src/plugins/debugger/gdb/gdbengine.cpp
+++ b/src/plugins/debugger/gdb/gdbengine.cpp
@@ -103,6 +103,17 @@ static bool isMostlyHarmlessMessage(const QStringRef &msg)
                   "Invalid argument\\n";
 }
 
+static QMessageBox *showMessageBox(QMessageBox::Icon icon,
+                                   const QString &title, const QString &text,
+                                   QMessageBox::StandardButtons buttons)
+{
+    auto mb = new QMessageBox(icon, title, text, buttons, ICore::mainWindow());
+    mb->setAttribute(Qt::WA_DeleteOnClose);
+    mb->setTextInteractionFlags(Qt::TextSelectableByMouse);
+    mb->show();
+    return mb;
+}
+
 ///////////////////////////////////////////////////////////////////////
 //
 // GdbEngine
@@ -2651,7 +2662,7 @@ static void handleShowModuleSymbols(const DebuggerResponse &response,
         }
         file.close();
         file.remove();
-        Internal::showModuleSymbols(modulePath, symbols);
+        DebuggerEngine::showModuleSymbols(modulePath, symbols);
     } else {
         AsynchronousMessageBox::critical(GdbEngine::tr("Cannot Read Symbols"),
             GdbEngine::tr("Cannot read symbols for module \"%1\".").arg(fileName));
@@ -2716,7 +2727,7 @@ void GdbEngine::handleShowModuleSections(const DebuggerResponse &response,
             }
         }
         if (!sections.isEmpty())
-            Internal::showModuleSections(moduleName, sections);
+            DebuggerEngine::showModuleSections(moduleName, sections);
     }
 }
 
diff --git a/src/plugins/debugger/lldb/lldbengine.cpp b/src/plugins/debugger/lldb/lldbengine.cpp
index d60b0951e7a..f75c491d5de 100644
--- a/src/plugins/debugger/lldb/lldbengine.cpp
+++ b/src/plugins/debugger/lldb/lldbengine.cpp
@@ -669,7 +669,7 @@ void LldbEngine::requestModuleSymbols(const QString &moduleName)
 {
     DebuggerCommand cmd("fetchSymbols");
     cmd.arg("module", moduleName);
-    cmd.callback = [moduleName](const DebuggerResponse &response) {
+    cmd.callback = [this, moduleName](const DebuggerResponse &response) {
         const GdbMi &symbols = response.data["symbols"];
         QString moduleName = response.data["module"].data();
         Symbols syms;
@@ -682,7 +682,7 @@ void LldbEngine::requestModuleSymbols(const QString &moduleName)
             symbol.demangled = item["demangled"].data();
             syms.append(symbol);
         }
-        Internal::showModuleSymbols(moduleName, syms);
+        showModuleSymbols(moduleName, syms);
     };
     runCommand(cmd);
 }
diff --git a/src/plugins/debugger/pdb/pdbengine.cpp b/src/plugins/debugger/pdb/pdbengine.cpp
index defd54050be..8d86407a4db 100644
--- a/src/plugins/debugger/pdb/pdbengine.cpp
+++ b/src/plugins/debugger/pdb/pdbengine.cpp
@@ -369,7 +369,7 @@ void PdbEngine::refreshSymbols(const GdbMi &symbols)
         symbol.name = item["name"].data();
         syms.append(symbol);
     }
-    Internal::showModuleSymbols(moduleName, syms);
+    showModuleSymbols(moduleName, syms);
 }
 
 bool PdbEngine::canHandleToolTip(const DebuggerToolTipContext &) const
diff --git a/src/plugins/debugger/sourceutils.cpp b/src/plugins/debugger/sourceutils.cpp
index a08221c4e14..ea50eca8bd6 100644
--- a/src/plugins/debugger/sourceutils.cpp
+++ b/src/plugins/debugger/sourceutils.cpp
@@ -161,7 +161,7 @@ static void blockRecursion(const Overview &overview,
     // Go backwards in case someone has identical variables in the same scope.
     // Fixme: loop variables or similar are currently seen in the outer scope
     for (int s = scope->memberCount() - 1; s >= 0; --s){
-        const Symbol *symbol = scope->memberAt(s);
+        const CPlusPlus::Symbol *symbol = scope->memberAt(s);
         if (symbol->isDeclaration()) {
             // Find out about shadowed symbols by bookkeeping
             // the already seen occurrences in a hash.
@@ -197,7 +197,7 @@ QStringList getUninitializedVariables(const Snapshot &snapshot,
     const Document::Ptr doc = docIt.value();
     // Look at symbol at line and find its function. Either it is the
     // function itself or some expression/variable.
-    const Symbol *symbolAtLine = doc->lastVisibleSymbolAt(line, 0);
+    const CPlusPlus::Symbol *symbolAtLine = doc->lastVisibleSymbolAt(line, 0);
     if (!symbolAtLine)
         return result;
     // First figure out the function to do a safety name check
diff --git a/src/plugins/help/qlitehtml/CMakeLists.txt b/src/plugins/help/qlitehtml/CMakeLists.txt
index c9bcd3326dc..b841a6bc7a9 100644
--- a/src/plugins/help/qlitehtml/CMakeLists.txt
+++ b/src/plugins/help/qlitehtml/CMakeLists.txt
@@ -4,19 +4,17 @@ project(QLiteHtml)
 
 if (EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/litehtml/CMakeLists.txt)
     set(ORIG_FPIC ${CMAKE_POSITION_INDEPENDENT_CODE})
-    set(ORIG_CMAKE_BUILD_TYPE ${CMAKE_BUILD_TYPE})
-    if (CMAKE_BUILD_TYPE STREQUAL "Debug" OR CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
-      set(CMAKE_BUILD_TYPE "RelWithDebInfo")
-    else()
-      set(CMAKE_BUILD_TYPE "Release")
-    endif()
     if (WIN32)
       set(LITEHTML_UTF8 ON)
     endif()
     set(CMAKE_POSITION_INDEPENDENT_CODE ON)
     add_subdirectory(litehtml)
-    set(CMAKE_BUILD_TYPE ${ORIG_CMAKE_BUILD_TYPE})
     set(CMAKE_POSITION_INDEPENDENT_CODE "${ORIG_FPIC}")
+    # force optimized litehtml even in debug
+    if (CMAKE_BUILD_TYPE STREQUAL "Debug")
+      target_compile_options(gumbo PRIVATE -O2)
+      target_compile_options(litehtml PRIVATE -O2)
+    endif()
 else()
     find_package(litehtml REQUIRED)
 endif()
diff --git a/src/plugins/help/qlitehtml/container_qpainter.cpp b/src/plugins/help/qlitehtml/container_qpainter.cpp
index 341c8b712f5..e3751f517c0 100644
--- a/src/plugins/help/qlitehtml/container_qpainter.cpp
+++ b/src/plugins/help/qlitehtml/container_qpainter.cpp
@@ -652,11 +652,9 @@ void DocumentContainer::buildIndex()
 
 void DocumentContainer::draw_background(litehtml::uint_ptr hdc, const litehtml::background_paint &bg)
 {
-    // TODO
     auto painter = toQPainter(hdc);
     if (bg.is_root) {
         // TODO ?
-        drawSelection(painter, toQRect(bg.border_box));
         return;
     }
     painter->save();
@@ -935,6 +933,14 @@ void DocumentContainer::render(int width, int height)
     m_selection.update();
 }
 
+void DocumentContainer::draw(QPainter *painter, const QRect &clip)
+{
+    drawSelection(painter, clip);
+    const QPoint pos = -m_scrollPosition;
+    const litehtml::position clipRect = {clip.x(), clip.y(), clip.width(), clip.height()};
+    document()->draw(reinterpret_cast<litehtml::uint_ptr>(painter), pos.x(), pos.y(), &clipRect);
+}
+
 QVector<QRect> DocumentContainer::mousePressEvent(const QPoint &documentPos,
                                                   const QPoint &viewportPos,
                                                   Qt::MouseButton button)
diff --git a/src/plugins/help/qlitehtml/container_qpainter.h b/src/plugins/help/qlitehtml/container_qpainter.h
index ab70d0561e9..018ea60a37b 100644
--- a/src/plugins/help/qlitehtml/container_qpainter.h
+++ b/src/plugins/help/qlitehtml/container_qpainter.h
@@ -143,6 +143,7 @@ public: // outside API
     litehtml::document::ptr document() const;
     void setScrollPosition(const QPoint &pos);
     void render(int width, int height);
+    void draw(QPainter *painter, const QRect &clip);
 
     // these return areas to redraw in document space
     QVector<QRect> mousePressEvent(const QPoint &documentPos,
diff --git a/src/plugins/help/qlitehtml/qlitehtmlwidget.cpp b/src/plugins/help/qlitehtml/qlitehtmlwidget.cpp
index 15174036f70..6692d56ffd8 100644
--- a/src/plugins/help/qlitehtml/qlitehtmlwidget.cpp
+++ b/src/plugins/help/qlitehtml/qlitehtmlwidget.cpp
@@ -523,17 +523,11 @@ void QLiteHtmlWidget::paintEvent(QPaintEvent *event)
     if (!d->documentContainer.document())
         return;
     d->documentContainer.setScrollPosition(scrollPosition());
-    const QPoint pos = -scrollPosition();
-    const QRect r = toVirtual(event->rect());
-    const litehtml::position clip = {r.x(), r.y(), r.width(), r.height()};
     QPainter p(viewport());
     p.setWorldTransform(QTransform().scale(d->zoomFactor, d->zoomFactor));
     p.setRenderHint(QPainter::SmoothPixmapTransform, true);
     p.setRenderHint(QPainter::Antialiasing, true);
-    d->documentContainer.document()->draw(reinterpret_cast<litehtml::uint_ptr>(&p),
-                                          pos.x(),
-                                          pos.y(),
-                                          &clip);
+    d->documentContainer.draw(&p, toVirtual(event->rect()));
 }
 
 static litehtml::element::ptr elementForY(int y, const litehtml::document::ptr &document)
diff --git a/src/plugins/languageclient/languageclientutils.cpp b/src/plugins/languageclient/languageclientutils.cpp
index cdb114b2f12..dd0668bb8ea 100644
--- a/src/plugins/languageclient/languageclientutils.cpp
+++ b/src/plugins/languageclient/languageclientutils.cpp
@@ -218,18 +218,29 @@ void updateEditorToolBar(Core::IEditor *editor)
         const QIcon icon = Utils::Icon({{":/languageclient/images/languageclient.png",
                                          Utils::Theme::IconsBaseColor}})
                                .icon();
-        actions[widget] = widget->toolBar()->addAction(icon, client->name(), [document]() {
-            auto menu = new QMenu;
-            for (auto client : LanguageClientManager::clientsSupportingDocument(document))
-                menu->addAction(client->name(), [client = QPointer<Client>(client), document]() {
-                    if (client)
+        actions[widget] = widget->toolBar()->addAction(
+            icon, client->name(), [document]() {
+                auto menu = new QMenu;
+                auto *clientsGroup = new QActionGroup(menu);
+                clientsGroup->setExclusive(true);
+                for (auto client : LanguageClientManager::clientsSupportingDocument(document)) {
+                    auto action = clientsGroup->addAction(client->name());
+                    auto reopen = [action, client = QPointer<Client>(client), document]() {
+                        if (!client)
+                            return;
                         LanguageClientManager::reOpenDocumentWithClient(document, client);
+                        action->setChecked(true);
+                    };
+                    action->setCheckable(true);
+                    action->setChecked(client == LanguageClientManager::clientForDocument(document));
+                    QObject::connect(action, &QAction::triggered, reopen);
+                }
+                menu->addActions(clientsGroup->actions());
+                menu->addAction("Manage...", []() {
+                    Core::ICore::showOptionsDialog(Constants::LANGUAGECLIENT_SETTINGS_PAGE);
                 });
-            menu->addAction("Manage...", []() {
-                Core::ICore::showOptionsDialog(Constants::LANGUAGECLIENT_SETTINGS_PAGE);
+                menu->popup(QCursor::pos());
             });
-            menu->popup(QCursor::pos());
-        });
         QObject::connect(widget, &QWidget::destroyed, [widget]() {
             actions.remove(widget);
         });
diff --git a/src/plugins/projectexplorer/gcctoolchain.cpp b/src/plugins/projectexplorer/gcctoolchain.cpp
index df6a1286fea..f81a3860a10 100644
--- a/src/plugins/projectexplorer/gcctoolchain.cpp
+++ b/src/plugins/projectexplorer/gcctoolchain.cpp
@@ -996,7 +996,7 @@ QList<ToolChain *> GccToolChainFactory::autoDetect(const QList<ToolChain *> &alr
 
 QList<ToolChain *> GccToolChainFactory::detectForImport(const ToolChainDescription &tcd)
 {
-    const QString fileName = tcd.compilerPath.toString();
+    const QString fileName = tcd.compilerPath.toFileInfo().completeBaseName();
     if ((tcd.language == Constants::C_LANGUAGE_ID && (fileName.startsWith("gcc")
                                                   || fileName.endsWith("gcc")))
             || (tcd.language == Constants::CXX_LANGUAGE_ID && (fileName.startsWith("g++")
@@ -1764,7 +1764,7 @@ QList<ToolChain *> MingwToolChainFactory::autoDetect(const QList<ToolChain *> &a
 
 QList<ToolChain *> MingwToolChainFactory::detectForImport(const ToolChainDescription &tcd)
 {
-    const QString fileName = tcd.compilerPath.toString();
+    const QString fileName = tcd.compilerPath.toFileInfo().completeBaseName();
     if ((tcd.language == Constants::C_LANGUAGE_ID && (fileName.startsWith("gcc")
                                                       || fileName.endsWith("gcc")))
             || (tcd.language == Constants::CXX_LANGUAGE_ID && (fileName.startsWith("g++")
diff --git a/src/plugins/python/CMakeLists.txt b/src/plugins/python/CMakeLists.txt
index 7ecc160f3a9..27f45669f7f 100644
--- a/src/plugins/python/CMakeLists.txt
+++ b/src/plugins/python/CMakeLists.txt
@@ -1,5 +1,5 @@
 add_qtc_plugin(Python
-  PLUGIN_DEPENDS Core ProjectExplorer TextEditor
+  PLUGIN_DEPENDS Core LanguageClient ProjectExplorer TextEditor
   SOURCES
     python.qrc
     pythoneditor.cpp pythoneditor.h
diff --git a/src/plugins/python/python.qbs b/src/plugins/python/python.qbs
index c90f76d5d1d..552186f8c99 100644
--- a/src/plugins/python/python.qbs
+++ b/src/plugins/python/python.qbs
@@ -9,6 +9,7 @@ QtcPlugin {
     Depends { name: "Core" }
     Depends { name: "TextEditor" }
     Depends { name: "ProjectExplorer" }
+    Depends { name: "LanguageClient" }
 
     Group {
         name: "General"
diff --git a/src/plugins/python/python_dependencies.pri b/src/plugins/python/python_dependencies.pri
index 5f2a87c2830..a62bb0e8af8 100644
--- a/src/plugins/python/python_dependencies.pri
+++ b/src/plugins/python/python_dependencies.pri
@@ -4,5 +4,6 @@ QTC_LIB_DEPENDS += \
     utils
 QTC_PLUGIN_DEPENDS += \
     coreplugin \
-    texteditor \
-    projectexplorer
+    languageclient \
+    projectexplorer \
+    texteditor
diff --git a/src/plugins/python/pythoneditor.cpp b/src/plugins/python/pythoneditor.cpp
index 145e88e1371..434ec9e1cc1 100644
--- a/src/plugins/python/pythoneditor.cpp
+++ b/src/plugins/python/pythoneditor.cpp
@@ -25,40 +25,241 @@
 
 #include "pythoneditor.h"
 #include "pythonconstants.h"
-#include "pythonplugin.h"
-#include "pythonindenter.h"
 #include "pythonhighlighter.h"
+#include "pythonindenter.h"
+#include "pythonplugin.h"
+#include "pythonproject.h"
+#include "pythonrunconfiguration.h"
+#include "pythonsettings.h"
 
+#include <coreplugin/infobar.h>
+
+#include <languageclient/client.h>
+#include <languageclient/languageclientinterface.h>
+#include <languageclient/languageclientmanager.h>
+
+#include <projectexplorer/session.h>
+#include <projectexplorer/target.h>
+
+#include <texteditor/textdocument.h>
 #include <texteditor/texteditoractionhandler.h>
 #include <texteditor/texteditorconstants.h>
-#include <texteditor/textdocument.h>
 
 #include <utils/qtcassert.h>
+#include <utils/synchronousprocess.h>
 
 #include <QCoreApplication>
+#include <QRegularExpression>
 
-using namespace TextEditor;
+using namespace ProjectExplorer;
+using namespace Utils;
 
 namespace Python {
 namespace Internal {
 
+static constexpr char startPylsInfoBarId[] = "PythonEditor::StartPyls";
+
+struct PythonForProject
+{
+    FilePath path;
+    PythonProject *project = nullptr;
+
+    QString name() const
+    {
+        if (!path.exists())
+            return {};
+        if (cachedName.first != path) {
+            SynchronousProcess pythonProcess;
+            const CommandLine pythonVersionCommand(path, {"--version"});
+            SynchronousProcessResponse response = pythonProcess.runBlocking(pythonVersionCommand);
+            cachedName.first = path;
+            cachedName.second = response.allOutput().trimmed();
+        }
+        return cachedName.second;
+    }
+
+private:
+    mutable QPair<FilePath, QString> cachedName;
+};
+
+static PythonForProject detectPython(TextEditor::TextDocument *document)
+{
+    PythonForProject python;
+
+    python.project = qobject_cast<PythonProject *>(
+        SessionManager::projectForFile(document->filePath()));
+    if (!python.project)
+        python.project = qobject_cast<PythonProject *>(SessionManager::startupProject());
+
+    if (python.project) {
+        if (auto target = python.project->activeTarget()) {
+            if (auto runConfig = qobject_cast<PythonRunConfiguration *>(
+                    target->activeRunConfiguration())) {
+                python.path = FilePath::fromString(runConfig->interpreter());
+            }
+        }
+    }
+
+    if (!python.path.exists())
+        python.path = PythonSettings::defaultInterpreter().command;
+
+    if (!python.path.exists() && !PythonSettings::interpreters().isEmpty())
+        python.path = PythonSettings::interpreters().first().command;
+
+    return python;
+}
+
+FilePath getPylsModulePath(CommandLine pylsCommand)
+{
+    pylsCommand.addArg("-h");
+    SynchronousProcess pythonProcess;
+    pythonProcess.setEnvironment(pythonProcess.environment() + QStringList("PYTHONVERBOSE=x"));
+    SynchronousProcessResponse response = pythonProcess.runBlocking(pylsCommand);
+
+    static const QString pylsInitPattern = "(.*)"
+                                           + QRegularExpression::escape(
+                                               QDir::toNativeSeparators("/pyls/__init__.py"))
+                                           + '$';
+    static const QString cachedPattern = " matches " + pylsInitPattern;
+    static const QRegularExpression regexCached(" matches " + pylsInitPattern,
+                                                QRegularExpression::MultilineOption);
+    static const QRegularExpression regexNotCached(" code object from " + pylsInitPattern,
+                                                   QRegularExpression::MultilineOption);
+
+    const QString &output = response.allOutput();
+    for (auto regex : {regexCached, regexNotCached}) {
+        QRegularExpressionMatch result = regex.match(output);
+        if (result.hasMatch())
+            return FilePath::fromUserInput(result.captured(1));
+    }
+    return {};
+}
+
+struct PythonLanguageServerState
+{
+    enum { CanNotBeInstalled, CanBeInstalled, AlreadyInstalled, AlreadyConfigured } state;
+    FilePath pylsModulePath;
+};
+
+static QList<const LanguageClient::StdIOSettings *> configuredPythonLanguageServer(
+    Core::IDocument *doc)
+{
+    using namespace LanguageClient;
+    QList<const StdIOSettings *> result;
+    for (const BaseSettings *setting : LanguageClientManager::currentSettings()) {
+        if (setting->m_languageFilter.isSupported(doc))
+            result << dynamic_cast<const StdIOSettings *>(setting);
+    }
+    return result;
+}
+
+static PythonLanguageServerState checkPythonLanguageServer(const FilePath &python,
+                                                           TextEditor::TextDocument *document)
+{
+    using namespace LanguageClient;
+    SynchronousProcess pythonProcess;
+    const CommandLine pythonLShelpCommand(python, {"-m", "pyls", "-h"});
+    SynchronousProcessResponse response = pythonProcess.runBlocking(pythonLShelpCommand);
+    if (response.allOutput().contains("Python Language Server")) {
+        const FilePath &modulePath = getPylsModulePath(pythonLShelpCommand);
+        for (const StdIOSettings *serverSetting : configuredPythonLanguageServer(document)) {
+            CommandLine serverCommand(FilePath::fromUserInput(serverSetting->m_executable),
+                                      serverSetting->arguments(),
+                                      CommandLine::Raw);
+
+            if (modulePath == getPylsModulePath(serverCommand))
+                return {PythonLanguageServerState::AlreadyConfigured, FilePath()};
+        }
+
+        return {PythonLanguageServerState::AlreadyInstalled, getPylsModulePath(pythonLShelpCommand)};
+    }
+
+    const CommandLine pythonPipVersionCommand(python, {"-m", "pip", "-V"});
+    response = pythonProcess.runBlocking(pythonPipVersionCommand);
+    if (response.allOutput().startsWith("pip "))
+        return {PythonLanguageServerState::CanBeInstalled, FilePath()};
+    else
+        return {PythonLanguageServerState::CanNotBeInstalled, FilePath()};
+}
+
+static LanguageClient::Client *registerLanguageServer(const PythonForProject &python)
+{
+    auto *settings = new LanguageClient::StdIOSettings();
+    settings->m_executable = python.path.toString();
+    settings->m_arguments = "-m pyls";
+    settings->m_name = PythonEditorFactory::tr("Python Language Server (%1)").arg(python.name());
+    settings->m_languageFilter.mimeTypes = QStringList(Constants::C_PY_MIMETYPE);
+    LanguageClient::LanguageClientManager::registerClientSettings(settings);
+    return LanguageClient::LanguageClientManager::clientForSetting(settings).value(0);
+}
+
+static void setupPythonLanguageServer(const PythonForProject &python,
+                                      QPointer<TextEditor::TextDocument> document)
+{
+    document->infoBar()->removeInfo(startPylsInfoBarId);
+    if (LanguageClient::Client *client = registerLanguageServer(python))
+        LanguageClient::LanguageClientManager::reOpenDocumentWithClient(document, client);
+}
+
+static void updateEditorInfoBar(const PythonForProject &python, TextEditor::TextDocument *document)
+{
+    const PythonLanguageServerState &lsState = checkPythonLanguageServer(python.path, document);
+
+    if (lsState.state == PythonLanguageServerState::CanNotBeInstalled
+        || lsState.state == PythonLanguageServerState::AlreadyConfigured
+        || lsState.state == PythonLanguageServerState::CanBeInstalled /* TODO */) {
+        return;
+    }
+
+    Core::InfoBar *infoBar = document->infoBar();
+    if (lsState.state == PythonLanguageServerState::AlreadyInstalled
+        && infoBar->canInfoBeAdded(startPylsInfoBarId)) {
+        auto message = PythonEditorFactory::tr("Found a Python language server for %1 (%2). "
+                                               "Should this one be set up for this document?")
+                           .arg(python.name(), python.path.toUserOutput());
+        Core::InfoBarEntry info(startPylsInfoBarId,
+                                message,
+                                Core::InfoBarEntry::GlobalSuppression::Enabled);
+        info.setCustomButtonInfo(TextEditor::BaseTextEditor::tr("Setup"),
+                                 [=]() { setupPythonLanguageServer(python, document); });
+        infoBar->addInfo(info);
+    }
+}
+
+static void documentOpened(Core::IDocument *document)
+{
+    auto textDocument = qobject_cast<TextEditor::TextDocument *>(document);
+    if (!textDocument || textDocument->mimeType() != Constants::C_PY_MIMETYPE)
+        return;
+
+    const PythonForProject &python = detectPython(textDocument);
+    if (!python.path.exists())
+        return;
+
+    updateEditorInfoBar(python, textDocument);
+}
+
 PythonEditorFactory::PythonEditorFactory()
 {
     setId(Constants::C_PYTHONEDITOR_ID);
-    setDisplayName(QCoreApplication::translate("OpenWith::Editors", Constants::C_EDITOR_DISPLAY_NAME));
+    setDisplayName(
+        QCoreApplication::translate("OpenWith::Editors", Constants::C_EDITOR_DISPLAY_NAME));
     addMimeType(Constants::C_PY_MIMETYPE);
 
-    setEditorActionHandlers(TextEditorActionHandler::Format
-                            | TextEditorActionHandler::UnCommentSelection
-                            | TextEditorActionHandler::UnCollapseAll
-                            | TextEditorActionHandler::FollowSymbolUnderCursor);
+    setEditorActionHandlers(TextEditor::TextEditorActionHandler::Format
+                            | TextEditor::TextEditorActionHandler::UnCommentSelection
+                            | TextEditor::TextEditorActionHandler::UnCollapseAll
+                            | TextEditor::TextEditorActionHandler::FollowSymbolUnderCursor);
 
-    setDocumentCreator([] { return new TextDocument(Constants::C_PYTHONEDITOR_ID); });
+    setDocumentCreator([] { return new TextEditor::TextDocument(Constants::C_PYTHONEDITOR_ID); });
     setIndenterCreator([](QTextDocument *doc) { return new PythonIndenter(doc); });
     setSyntaxHighlighterCreator([] { return new PythonHighlighter; });
-    setCommentDefinition(Utils::CommentDefinition::HashStyle);
+    setCommentDefinition(CommentDefinition::HashStyle);
     setParenthesesMatchingEnabled(true);
     setCodeFoldingSupported(true);
+
+    connect(Core::EditorManager::instance(), &Core::EditorManager::documentOpened,
+            this, documentOpened);
 }
 
 } // namespace Internal
diff --git a/src/plugins/python/pythonrunconfiguration.h b/src/plugins/python/pythonrunconfiguration.h
index 753be4c2968..bb5139e615a 100644
--- a/src/plugins/python/pythonrunconfiguration.h
+++ b/src/plugins/python/pythonrunconfiguration.h
@@ -42,6 +42,7 @@ class PythonRunConfiguration : public ProjectExplorer::RunConfiguration
 
 public:
     PythonRunConfiguration(ProjectExplorer::Target *target, Core::Id id);
+    QString interpreter() const;
 
 private:
     void doAdditionalSetup(const ProjectExplorer::RunConfigurationCreationInfo &) final;
@@ -49,7 +50,6 @@ private:
     bool supportsDebugger() const;
     QString mainScript() const;
     QString arguments() const;
-    QString interpreter() const;
 
     void updateTargetInformation();
 };
diff --git a/src/plugins/qmldesigner/components/timelineeditor/timelinesectionitem.cpp b/src/plugins/qmldesigner/components/timelineeditor/timelinesectionitem.cpp
index bf6705fbeef..c60be833d2d 100644
--- a/src/plugins/qmldesigner/components/timelineeditor/timelinesectionitem.cpp
+++ b/src/plugins/qmldesigner/components/timelineeditor/timelinesectionitem.cpp
@@ -801,10 +801,19 @@ void TimelineBarItem::itemMoved(const QPointF &start, const QPointF &end)
     if (isActiveHandle(Location::Undefined))
         dragInit(rect(), start);
 
-    const qreal min = qreal(TimelineConstants::sectionWidth + TimelineConstants::timelineLeftOffset
-                            - scrollOffset());
-    const qreal max = qreal(timelineScene()->rulerWidth() - TimelineConstants::sectionWidth
-                            + rect().width());
+    qreal min = qreal(TimelineConstants::sectionWidth + TimelineConstants::timelineLeftOffset
+                      - scrollOffset());
+    qreal max = qreal(timelineScene()->rulerWidth() - TimelineConstants::sectionWidth
+                      + rect().width());
+
+    const qreal minFrameX = mapFromFrameToScene(timelineScene()->startFrame());
+    const qreal maxFrameX = mapFromFrameToScene(timelineScene()->endFrame());
+
+    if (min < minFrameX)
+        min = minFrameX;
+
+    if (max > maxFrameX)
+        max = maxFrameX;
 
     if (isActiveHandle(Location::Center))
         dragCenter(rect(), end, min, max);
diff --git a/src/shared/designerintegrationv2/CMakeLists.txt b/src/shared/designerintegrationv2/CMakeLists.txt
index 0298277a160..8e2520d50e7 100644
--- a/src/shared/designerintegrationv2/CMakeLists.txt
+++ b/src/shared/designerintegrationv2/CMakeLists.txt
@@ -3,7 +3,7 @@ if (NOT TARGET Qt5::Designer)
 endif()
 
 add_qtc_library(designerintegrationv2 STATIC
-  DEPENDS Qt5::Designer
+  DEPENDS Qt5::Designer Qt5::Widgets
   SOURCES
   formresizer.cpp formresizer.h
   sizehandlerect.cpp sizehandlerect.h