Start porting mouse handles to layout

Author: nyalldawson

python/core/layout/qgslayout.sip

@@ -26,6 +26,7 @@ class QgsLayout : QGraphicsScene, QgsExpressionContextGenerator, QgsLayoutUndoOb
       ZItem,
       ZGrid,
       ZGuide,
+      ZMouseHandles,
       ZMapTool,
       ZSnapIndicator,
     };

src/core/layout/qgslayout.h

@@ -47,8 +47,9 @@ class CORE_EXPORT QgsLayout : public QGraphicsScene, public QgsExpressionContext
       ZItem = 1, //!< Minimum z value for items
       ZGrid = 9998, //!< Z-value for page grids
       ZGuide = 9999, //!< Z-value for page guides
-      ZMapTool = 10000, //!< Z-value for temporary map tool items
-      ZSnapIndicator = 10001, //!< Z-value for snapping indicator
+      ZMouseHandles = 10000, //!< Z-value for mouse handles
+      ZMapTool = 10001, //!< Z-value for temporary map tool items
+      ZSnapIndicator = 10002, //!< Z-value for snapping indicator
     };
 
     /**

src/gui/CMakeLists.txt

@@ -161,6 +161,7 @@ SET(QGIS_GUI_SRCS
 
   layout/qgslayoutitemguiregistry.cpp
   layout/qgslayoutitemwidget.cpp
+  layout/qgslayoutmousehandles.cpp
   layout/qgslayoutnewitempropertiesdialog.cpp
   layout/qgslayoutruler.cpp
   layout/qgslayoutunitscombobox.cpp
@@ -657,6 +658,7 @@ SET(QGIS_GUI_MOC_HDRS
   layout/qgslayoutdesignerinterface.h
   layout/qgslayoutitemguiregistry.h
   layout/qgslayoutitemwidget.h
+  layout/qgslayoutmousehandles.h
   layout/qgslayoutnewitempropertiesdialog.h
   layout/qgslayoutruler.h
   layout/qgslayoutunitscombobox.h