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/plugins/qmldesigner/designmodewidget.cpp

@@ -228,8 +228,9 @@ void DesignModeWidget::setup()
 
     auto settings = Core::ICore::settings(QSettings::UserScope);
 
+    ADS::DockManager::setConfigFlags(ADS::DockManager::DefaultNonOpaqueConfig);
+    ADS::DockManager::setConfigFlag(ADS::DockManager::FocusHighlighting, true);
     m_dockManager = new ADS::DockManager(this);
-    m_dockManager->setConfigFlags(ADS::DockManager::DefaultNonOpaqueConfig);
     m_dockManager->setSettings(settings);
     m_dockManager->setWorkspacePresetsPath(Core::ICore::resourcePath() + QLatin1String("/qmldesigner/workspacePresets/"));