Merge pull request #1317 from livius2/fix_ochange_event_nil_node

Fix OnChange event with post nil if the note is the same

Author: joachimmarder

Source/VirtualTrees.BaseTree.pas

@@ -12607,7 +12607,7 @@ procedure TBaseVirtualTree.HandleMouseDown(var Message: TWMMouse; var HitInfo: T
  if NeedChangeEvent then
  begin
  Invalidate;
- Change(nil);
+ Change(HitInfo.HitNode);
  end;
  end
  else if (toAlwaysSelectNode in Self.TreeOptions.SelectionOptions) then