Benjamin Stover a38eb5067f Bug 524925 - Recompute overflow without reflowing for transforms. part=1/6 r=dbaron ...

Add an extra change hint, UpdateOverflow, that can be used to specify that
a frame's overflow areas may have changed and that they need to be recalculated.
When a transform on a frame changes, instead of marking it for reflow, set this
hint instead.

There is an added virtual function on nsIFrame, UpdateOverflow, which is called
recursively on a frame when the corresponding hint is set, to allow it to
update its overflow areas.

2011-06-15 14:03:49 -07:00

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