ADS: Integrate newest base repository commits

* Activate new ADS feature focus highlight
* Remove resources.qrc and related *.svg files
* Clean up new and existing source

Base repository was merged until commit
3de877fe5635ff51a6d1205ca98aad85d204427f

Merged changes from base repository include the following:

* Fix wrong current index when removing a widget from DockAreaLayout
* Fix invisible TabWidget for DockWidgets that are not part of a
  restored state
* Enable ClickFocus for DockWidget to support focussing in case the
  content does not support it
* Move focus related functionality into DockFocusController class
* Add new DockManger config flag FocusStyling
* Add support for focus styling of FloatingWidgetTitleBar
* Improve focus handling when dropping a DockWidget
* Improve highlighting focused DockWidget
* Improve setting of DockWidgetTab focus
* Add styling of focused DockWidget
* Fix docking of floating widgets for macOS
* Fix setting of DockingStateReader file version - use internal file
  version instead of user file version
* Fix saveState() and restoreState() version handling to work like the
  function from QMainWindow
* Fix escape key handling in native window event function if event
  WM_EXITSIZEMOVE occurs
* Implement windows drag handling with native WM_ nonclient area
  messages
* Fix showing DockArea when inserting a DockWidget in a hidden DockArea
* Fix setting DockAreaTabBar index to prevent showing of tab 0 when
  inserting a DockWidget into an area with no current index tab
* Fix wrong insertion order of DockWidget when dropping a floating
  widget to the left or top container drop area
* Fix tab changes position when redocking it to the same position
* Add nullptr check to fix potential nullptr access when closing a
  FloatingDockContainer
* Fix single DockArea cannot be split
* Fix visibility issue when adding dock widget after all other dock
  widgets have ben closed
* Fix FloatingDragPreview flashing of hidden overlay when dragging the
  last visible DockWidget in non opaque docking mode
* Fix FloatingDragPreview preventing dock widget from floating when
  dragging over another dock widget
* Fix DockWidget::setWidget function to test for QAbstractScrollArea
  instead of QScrollArea. Now setWidget properly supports ItemViews like
  QTreeView or QTableView
* Fix wrong display of center drop area when dragging over invisible
  dock area title bar
* Fix bug that drop overlay sometimes was not visible when moving the
  drag preview over a floating window
* Fix dropping of FloatingDragPreview into center of dock container with
  only one single visible dock area. If this happens the dropped dock
  widget needs to get tabified
* Fix crash when trying to make a DockWidget floating in non-opaque mode
  if the DockWidget is not floatable
* Fix DockWidgetTab to provide the right size when starting floating
* Add DockWidget functions setAsCurrentTab, raise, isCurrentTab,
  isTabbed
* Add new config flag HideSingleCentralWidgetTitleBar to enable a
  central single dock widget in the main dock container (dock manager)
  without titlebar
* Fix DockContainerWidget::hasTopLevelDockWidget() and
  DockContainerWidget::topLevelDockArea() to work properly also for the
  main non floating dock container
* Fix ElidingLabel to properly support Qt::ElideNone
* Add setElideMode function to DockWidgetTab
* Add setFullScreen(), setNormal() and isFullScreen() function to
  DockWidget
* Fix takeWidget() function and fixed setWidget() function to handle
  case when there is already a content widget

Task-number: QDS-2180
Change-Id: Ie30648ba329016c91fd19e9b4e12e31e47614b18
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/libs/advanceddockingsystem/dockwidget.h

@@ -152,8 +152,8 @@ public:
     using Super = QFrame;
 
     enum DockWidgetFeature {
-        DockWidgetClosable = 0x01,
-        DockWidgetMovable = 0x02,///< this feature is not properly implemented yet and is ignored
+        DockWidgetClosable = 0x01,///< dock widget has a close button
+        DockWidgetMovable = 0x02,///< dock widget is movable and can be moved to a new position in the current dock container
         DockWidgetFloatable = 0x04,
         DockWidgetDeleteOnClose = 0x08, ///< deletes the dock widget when it is closed
         CustomCloseHandling = 0x10,
@@ -435,6 +435,26 @@ public:
     void setTabToolTip(const QString &text);
 #endif
 
+    /**
+     * Returns true if the dock widget is floating and if the floating dock
+     * container is full screen
+     */
+    bool isFullScreen() const;
+
+    /**
+     * Returns true if this dock widget is in a dock area, that contains at
+     * least 2 opened dock widgets
+     */
+    bool isTabbed() const;
+
+    /**
+     * Returns true if this dock widget is the current one in the dock
+     * area widget that contains it.
+     * If the dock widget is the only opened dock widget in a dock area,
+     * the true is returned
+     */
+    bool isCurrentTab() const;
+
 public: // reimplements QFrame
     /**
      * Emits titleChanged signal if title change event occurs
@@ -447,6 +467,23 @@ public: // reimplements QFrame
      */
     void toggleView(bool open = true);
 
+    /**
+     * Makes this dock widget the current tab in its dock area.
+     * The function only has an effect, if the dock widget is open. A call
+     * to this function will not toggle the view, so if it is closed,
+     * nothing will happen
+     */
+    void setAsCurrentTab();
+
+    /**
+     * Brings the dock widget to the front
+     * This means:
+     * - If the dock widget is tabbed with other dock widgets but its tab is not current, it's made current.
+     * - If the dock widget is floating, QWindow::raise() is called.
+     * This only applies if the dock widget is already open. If closed, does nothing.
+     */
+    void raise();
+
     /**
      * This function will make a docked widget floating
      */
@@ -463,6 +500,26 @@ public: // reimplements QFrame
      */
     void closeDockWidget();
 
+    /**
+     * Shows the widget in full-screen mode.
+     * Normally this function only affects windows. To make the interface
+     * compatible to QDockWidget, this function also maximizes a floating
+     * dock widget.
+     *
+     * \note Full-screen mode works fine under Windows, but has certain
+     * problems (doe not work) under X (Linux). These problems are due to
+     * limitations of the ICCCM protocol that specifies the communication
+     * between X11 clients and the window manager. ICCCM simply does not
+     * understand the concept of non-decorated full-screen windows.
+     */
+    void showFullScreen();
+
+    /**
+     * This function complements showFullScreen() to restore the widget
+     * after it has been in full screen mode.
+     */
+    void showNormal();
+
 signals:
     /**
      * This signal is emitted if the dock widget is opened or closed