On Aug 30, 2016, at 10:10 AM, Sean McBride <s...@rogue-research.com> wrote:
> 
> I have a drawing bug in my app, and reduced it to a toy app.  Basically, I 
> create an NSBorderlessWindowMask type window who's content view draws a 
> translucent rounded rect.  Its only subview is an NSTextField that draws a 
> number in a big font.  When I display the window, all is well.  But when I 
> change the textfield text, or even simply remove the textfield, its old 
> string half remains in a ghostly outline.  This works in 10.9 and 10.10, but 
> is buggy in 10.11 and 10.12.  I figure it's an OS bug, but maybe the 
> description rings any bells for anyone?

Does the window have a shadow?  Are you invalidating the shadow whenever the 
content gets redrawn (since the shadow of a partially-transparent window depend 
on exactly what was drawn non-transparently)?

Regards,
Ken


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