[Etoys] Screen damage issues when dropping tiles in ScriptEditor

[karl]

karl skrev:
> Yoshiki Ohshima skrev:
>>> When I turn on preference showDebugDamage there are some
>>> issues when dropping tiles in the ScriptEditor. A rectangle in the
>>> top left corner flashes, and a large part of the screen is redrawn when
>>> the tile is dropped, from top left of screen to bottom right of 
>>> ScriptEditor.
>>> I guess this will slow the tile scripting responsiveness.
>>> Also the Viewer flap tabs are redrawn quite often, not flap tabs for 
>>> SketchMorphs, but for other morphs.
>>> Karl
>>>     
>>
>>   Thanks Karl for reporting!  We did use showDebugDamage when damage
>> rectangle merging was too eagar^^; But after that we didn't look at
>> other places with the option turn on yet.
> I did some bug hunting on the ScriptEditorMorph redraw bug and it is 
> really hard to track down, at least for me :-)
> It seems the bug is related to a bug in Squeak3.9 when SystemBrowsers 
> causes extensive redrawing when the comment pane pops up and hides. I 
> have looked at Morph>>privateAddMorph:atIndex: and a few layout 
> related methods but have not found the cause yet. 
I think I fixed it. Seems like the morph being dropped needed a specific 
position to be dropped otherwise it would be added to the top left 
corner of the screen causing lots of screen damage.
karl
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