In my app the user can resize a TreeView horizontally by dragging the mouse on some resizer. On Mac, when I move the mouse really fast from left to right, the content of the TreeView seems not to be repainted correctly.
Example: TreeView is 100 pixels width. I resize it very fast to 500 pixels width and the contents of the TreeView still stay 100 pixels wide. The vertical scrollbar of the TreeView is repositioned correctly. When I move the mouse slowly there is now problem.
When I modify TreeView a little bit like this, then it all works.
void TreeView::itemsChanged() throw()
needsRecalculating = true;