Ref T472, fixed expandAll/fullResizeToContents heap issue

* after updating the container update "expandAll" was called
* in onExpanded multiple "fullResizeToContents" occured, resulting in the healp issue below
* as it was a good idea anyway to reduce the slow "fullResizeToContents" anyway, so we are using a CDigestSignal
* this also solved the HEAP issue (for some reason I have NOT investigated)

HEAP[swiftdata.exe]: HEAP: Free Heap block 000001AB439BFFF0 modified at 000001AB439C00BC after it was freed

src/blackgui/views/aircraftcategorytreeview.h

@@ -14,6 +14,7 @@
 
 #include "blackgui/blackguiexport.h"
 #include "blackmisc/aviation/aircraftcategorylist.h"
+#include "blackmisc/digestsignal.h"
 
 #include <QTreeView>
 #include <QObject>
@@ -46,12 +47,12 @@ namespace BlackGui
             //! Clear
             void clear();
 
-            //! Set columns
-            void setColumns(const Models::CColumns &columns);
-
             //! Resize all columns
             void fullResizeToContents();
 
+            //! Set columns
+            void setColumns(const Models::CColumns &columns);
+
             //! Empty data
             bool isEmpty() const;
 
@@ -62,6 +63,9 @@ namespace BlackGui
             //! Used model
             BlackGui::Models::CAircraftCategoryTreeModel *categoryModel();
 
+            //! Resize all columns
+            void fullResizeToContentsImpl();
+
             //! The selected object
             BlackMisc::Aviation::CAircraftCategory selectedObject() const;
 
@@ -73,6 +77,8 @@ namespace BlackGui
 
             //! Custom menu
             void customMenu(const QPoint &point);
+
+            BlackMisc::CDigestSignal m_dsFullResize { this, &CAircraftCategoryTreeView::fullResizeToContentsImpl, 1000, 25 };
         };
     } // ns
 } // ns