Core: Fix crash after adding output pane in lazy loaded plugin

Change-Id: I0d3059e77e01f066981d0f531287aecfa9bd6a1b
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/coreplugin/outputpanemanager.cpp

@@ -79,6 +79,10 @@ IOutputPane::IOutputPane(QObject *parent)
     m_zoomOutButton = Command::createToolButtonWithShortcutToolTip(Constants::ZOOM_OUT);
     m_zoomOutButton->setIcon(Utils::Icons::MINUS_TOOLBAR.icon());
     connect(m_zoomOutButton, &QToolButton::clicked, this, [this] { emit zoomOutRequested(1); });
+
+    // reinitialize the output pane buttons if a lazy loaded plugin adds a pane
+    if (OutputPaneManager::initialized())
+        QMetaObject::invokeMethod(this, &OutputPaneManager::setupButtons, Qt::QueuedConnection);
 }
 
 IOutputPane::~IOutputPane()
@@ -512,6 +516,34 @@ OutputPaneManager::OutputPaneManager(QWidget *parent) :
 
 void OutputPaneManager::initialize()
 {
+    setupButtons();
+
+    const int currentIdx = m_instance->currentIndex();
+    if (QTC_GUARD(currentIdx >= 0 && currentIdx < g_outputPanes.size()))
+        m_instance->m_titleLabel->setText(g_outputPanes[currentIdx].pane->displayName());
+    m_instance->m_buttonsWidget->layout()->addWidget(m_instance->m_manageButton);
+    connect(m_instance->m_manageButton,
+            &OutputPaneManageButton::menuRequested,
+            m_instance,
+            &OutputPaneManager::popupMenu);
+
+    updateMaximizeButton(false); // give it an initial name
+
+    m_instance->readSettings();
+
+    connect(ModeManager::instance(), &ModeManager::currentModeChanged, m_instance, [] {
+        const int index = m_instance->currentIndex();
+        m_instance->updateActions(index >= 0 ? g_outputPanes.at(index).pane : nullptr);
+    });
+
+    m_instance->m_initialized = true;
+}
+
+void OutputPaneManager::setupButtons()
+{
+    for (auto pane : g_outputPanes)
+        delete pane.button;
+
     ActionContainer *mpanes = ActionManager::actionContainer(Constants::M_VIEW_PANES);
     QFontMetrics titleFm = m_instance->m_titleLabel->fontMetrics();
     int minTitleWidth = 0;
@@ -526,8 +558,10 @@ void OutputPaneManager::initialize()
     for (int i = 0; i != n; ++i) {
         OutputPaneData &data = g_outputPanes[i];
         IOutputPane *outPane = data.pane;
-        const int idx = m_instance->m_outputWidgetPane->addWidget(outPane->outputWidget(m_instance));
-        QTC_CHECK(idx == i);
+        QWidget *widget = outPane->outputWidget(m_instance);
+        int idx = m_instance->m_outputWidgetPane->indexOf(widget);
+        if (idx < 0) {
+            idx = m_instance->m_outputWidgetPane->insertWidget(i, widget);
 
             connect(outPane, &IOutputPane::showPage, m_instance, [idx](int flags) {
                 m_instance->showPage(idx, flags);
@@ -555,16 +589,25 @@ void OutputPaneManager::initialize()
             toolButtonsRow.addItem(st);
             toolButtonsRow.attachTo(toolButtonsContainer);
 
-        m_instance->m_opToolBarWidgets->addWidget(toolButtonsContainer);
+            m_instance->m_opToolBarWidgets->insertWidget(i, toolButtonsContainer);
+        }
+        QTC_CHECK(idx == i);
 
         minTitleWidth = qMax(minTitleWidth, titleFm.horizontalAdvance(outPane->displayName()));
 
         data.id = baseId.withSuffix(outPane->id().toString());
+        if (data.action) {
+            ActionManager::unregisterAction(data.action, data.id);
+            delete data.action;
+        }
+
         data.action = new QAction(outPane->displayName(), m_instance);
-        Command *cmd = ActionManager::registerAction(data.action, data.id);
+        connect(data.action, &QAction::triggered, m_instance, [i] {
+            m_instance->shortcutTriggered(i);
+        });
 
+        auto cmd = ActionManager::registerAction(data.action, data.id);
         mpanes->addAction(cmd, "Coreplugin.OutputPane.PanesGroup");
-
         cmd->setDefaultKeySequence(paneShortCut(shortcutNumber));
         auto button = new OutputPaneToggleButton(shortcutNumber,
                                                  outPane->displayName(),
@@ -588,32 +631,11 @@ void OutputPaneManager::initialize()
 
         const bool visible = outPane->priorityInStatusBar() >= 0;
         data.button->setVisible(visible);
-
-        connect(data.action, &QAction::triggered, m_instance, [i] {
-            m_instance->shortcutTriggered(i);
-        });
     }
 
     m_instance->m_titleLabel->setMinimumWidth(
         minTitleWidth + m_instance->m_titleLabel->contentsMargins().left()
         + m_instance->m_titleLabel->contentsMargins().right());
-    const int currentIdx = m_instance->currentIndex();
-    if (QTC_GUARD(currentIdx >= 0 && currentIdx < g_outputPanes.size()))
-        m_instance->m_titleLabel->setText(g_outputPanes[currentIdx].pane->displayName());
-    m_instance->m_buttonsWidget->layout()->addWidget(m_instance->m_manageButton);
-    connect(m_instance->m_manageButton,
-            &OutputPaneManageButton::menuRequested,
-            m_instance,
-            &OutputPaneManager::popupMenu);
-
-    updateMaximizeButton(false); // give it an initial name
-
-    m_instance->readSettings();
-
-    connect(ModeManager::instance(), &ModeManager::currentModeChanged, m_instance, [] {
-        const int index = m_instance->currentIndex();
-        m_instance->updateActions(index >= 0 ? g_outputPanes.at(index).pane : nullptr);
-    });
 }
 
 OutputPaneManager::~OutputPaneManager() = default;
@@ -649,6 +671,11 @@ void OutputPaneManager::setOutputPaneHeightSetting(int value)
     m_instance->m_outputPaneHeightSetting = value;
 }
 
+bool OutputPaneManager::initialized()
+{
+    return m_instance && m_instance->m_initialized;
+}
+
 void OutputPaneManager::toggleMaximized()
 {
     OutputPanePlaceHolder *ph = OutputPanePlaceHolder::getCurrent();

src/plugins/coreplugin/outputpanemanager.h

@@ -37,6 +37,7 @@ public:
 
     static int outputPaneHeightSetting();
     static void setOutputPaneHeightSetting(int value);
+    static bool initialized();
 
 public slots:
     void slotHide();
@@ -54,12 +55,14 @@ private:
     friend class ICorePrivate;
     friend class MainWindow;
     friend class OutputPaneManageButton;
+    friend class Core::IOutputPane;
 
     explicit OutputPaneManager(QWidget *parent = nullptr);
     ~OutputPaneManager() override;
 
     static void create();
     static void initialize();
+    static void setupButtons();
     static void destroy();
 
     void shortcutTriggered(int idx);
@@ -86,6 +89,7 @@ private:
     QStackedWidget *m_opToolBarWidgets = nullptr;
     QWidget *m_buttonsWidget = nullptr;
     int m_outputPaneHeightSetting = 0;
+    bool m_initialized = false;
 };
 
 class BadgeLabel