Prepare for position:sticky support inside accelerated overflow-scroll with WK2
https://bugs.webkit.org/show_bug.cgi?id=133329
Reviewed by Tim Horton.
RenderLayerCompositor::computeStickyViewportConstraints() was always using
the viewport rect as the constraining rect for sticky position. This is not
correct when inside overflow:scroll.
Refactor code in RenderBoxModelObject to make getting the rect easy, and use
it to compute the constraints.
* rendering/RenderBoxModelObject.cpp:
(WebCore::RenderBoxModelObject::constrainingRectForStickyPosition):
(WebCore::RenderBoxModelObject::stickyPositionOffset):
* rendering/RenderBoxModelObject.h:
* rendering/RenderLayerCompositor.cpp:
(WebCore::RenderLayerCompositor::computeStickyViewportConstraints):
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@169408 268f45cc-cd09-0410-ab3c-d52691b4dbfc
4 files changed
