Martin Robinson ef82d772c1 Don't promote all scrollable regions to stacking contexts ... Instead annotate all flows with their owning ScrollRoots. When processing the display list items into a flattened display list, we add PushScrollRoot and PopScrollRoot to signal when scrolling regions start and end. It is possible for content from different scrolling regions to intersect and when they do, the stack of scrolling regions is duplicated. When these duplicated scrolling regions stacks reach WebRender, it will scroll them in tandem. The PushScrollRoot and PopScrollRoot items are currently represented as StackingContexts in WebRender, but eventually these will be replaced with special WebRender display items. Fixes #13529. Fixed #13298.		2016-11-05 18:36:45 +01:00
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mod.rs	Don't promote all scrollable regions to stacking contexts	2016-11-05 18:36:45 +01:00