I've just noticed another odd behaviour of NSOutlineView. This is on 10.8 and 
I've never noticed this before, so it might be something new.

When I click a turn-down triangle to open an outline item, all of the text 
draws in a slightly bigger font for the duration of the triangle's animation, 
then it goes back to normal. I'm using a custom text cell and it draws using 
the "small system font" which is only 11pts. I would estimate that the larger 
size is 12 or 13 pts - it's not much bigger.


Ah, I'm thinking this *could* be due to my previous observation about cells 
being copied using NSCopyObject. If the cells are copied during that animation 
for some reason, then perhaps the text settings for my custom cell are not 
being copied, since I'm alloc/initing a new cell in copyWithZone: instead of 
relying on super's implementation. I'll follow along with that line of 
thought....



--Graham



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