This fixes a rather subtle bug. What the underlying code here is trying
to do is remove nsChangeHint_UpdateContainingBlock when some properties
that influence whether a frame is a containing block for absolutely
positioned or fixed positioned elements have changed, but the final
calculation of being a containing block has not changed. However, the
old code was using a function that tested whether the style could
*possibly* lead to a frame being a containing block. Some of the
properties (like the transform properties) that lead to being a
containing block, for example, don't apply to non-replaced inlines.
Some, however, do (such as 'filter'). So if there's a dynamic change
adding or removing a filter, on an inline that also has an *ignored*
transform property (like 'transform' or 'perspective') set, then the
code prior to this patch causes us to remove the UpdateContainingBlock
hint.
This patch fixes things by testing whether being a containing block
could have changed for *any* type of frame, by separately testing the
changes.
The added tests fail without the patch and pass with the patch, viewed
in isolation. However, without the previous patch, test 003 passes.
Test 003 also fails in Chrome (but 001 and 002 pass).
Differential Revision: https://phabricator.services.mozilla.com/D2814
--HG--
extra : rebase_source : 0a5dbb15a058cf4a43d989bf53f042c5b718e24d
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