On Saturday, March 2, 2019 at 10:38:34 AM UTC-6, vitalije wrote:

May I suggest using QGraphicsScene, QGraphicsView and QGraphicsItems. They 
> would be perfect match for FastRedraw code. You may place one QGraphicsView 
> widget in its own pane so it may coexist with the outline pane while 
> experimenting and can be updated by a script button. Clicking in the new 
> widget can be delegated to the old tree widget. That way it would be 
> possible to find which code parts from the old tree widget should be copied 
> to the new one. And finally it might be possible at the end to switch from 
> the old tree widget to the new one during the GUI initialization. The 
> changes in the Leo code would be minimal. 
>

Thanks for this suggestion.  I have added it to #1068 
<https://github.com/leo-editor/leo-editor/issues/1068>.

Edward

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