* Update header state when mouse leaves control

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@2581 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/virtualtreeview-new/branches/4.8/VirtualTrees.pas

@@ -10109,6 +10109,15 @@ begin
                               hsHeightTracking, hsHeightTrackPending];
       end;
     // hovering, mouse leave detection
+    CM_MOUSELEAVE:
+      with FColumns do
+      begin
+        if FHoverIndex > NoColumn then
+          Invalidate(Items[FHoverIndex]);
+        FHoverIndex := NoColumn;
+        FClickIndex := NoColumn;
+        FDownIndex := NoColumn;
+      end;
     //todo: see the difference to below
     LM_MOUSEMOVE:
       with TLMMouseMove(Message), FColumns do