Reflow and invalidation

[Boris Zbarsky]

What's the contract for invalidating during reflow?  nsIFrame seems to 
be silent on the matter... In particular, who is responsible for calling 
Invalidate() on which rects in the following situations:

1)  Frame is resized (eg "width" attr of image changed)
2)  Frame is repositioned (eg "align" attr of <legend> changed)
3)  Both
The options here are "the frame affected" and "the parent of the 
affected frame (possibly via a proxy such as nsLineBox)", I think. Are 
there other options?  Are there other cases of reflow-related 
invalidates needing to happen?

How is this related to the changehint for various attributes?  Should 
the hint for cases that require reflow be just ReflowFrame, or include a 
paint hint?  If the latter, is that paint expected to happen before or 
after the reflow?

-Boris
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