зеркало из https://github.com/mozilla/gecko-dev.git
8dab980fec
In nsIFrame::BuildDisplayListForChild for certain types of frames we create wrap list items to wrap the constructed display list to make those items inseperable. We were using the current scroll clip by default when creating these items, but that scroll clip may not contain all the content in the display list if we traversed into an out of flow frame whose containing block is an ancestor of the current frame. The CurrentAncestorScrollClipForStackingContextContents keeps track of exactly this. (Its name might be a little misleading as we may not be dealing with a true stacking context here. Nevertheless it does contain the correct clip.) We also need to initialize the value of mStackingContextAncestorSC when we create an AutoSaveRestore because we are now using that value sometimes without calling Enter/ExitStackingContext (which initializes mStackingContextAncestorSC). |
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