The fix for https://bugs.webkit.org/show_bug.cgi?id=111176 allowed fixed positioned elements inside a named flow to be positioned/sized properly relative to viewport instead of first region in the chain. The next step is to enable these elements to become composited too on platforms supporting compositing (similar to the fixed elements that are not inside a named flow).
Created attachment 219278 [details] WIP1
Created attachment 221051 [details] WIP2
Created attachment 221129 [details] WIP3
Created attachment 221238 [details] Patch
Attachment 221238 [details] did not pass style-queue: Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'LayoutTests/ChangeLog', u'LayoutTests/compositing/regions/abs-in-named-flow-from-fixed-in-named-flow-expected.txt', u'LayoutTests/compositing/regions/abs-in-named-flow-from-fixed-in-named-flow.html', u'LayoutTests/compositing/regions/fixed-in-diff-named-flows-zIndex-expected.html', u'LayoutTests/compositing/regions/fixed-in-diff-named-flows-zIndex.html', u'LayoutTests/compositing/regions/fixed-in-named-flow-clip-descendant-expected.txt', u'LayoutTests/compositing/regions/fixed-in-named-flow-clip-descendant.html', u'LayoutTests/compositing/regions/fixed-in-named-flow-expected.txt', u'LayoutTests/compositing/regions/fixed-in-named-flow-from-abs-in-named-flow-expected.txt', u'LayoutTests/compositing/regions/fixed-in-named-flow-from-abs-in-named-flow.html', u'LayoutTests/compositing/regions/fixed-in-named-flow-from-outflow-expected.txt', u'LayoutTests/compositing/regions/fixed-in-named-flow-from-outflow.html', u'LayoutTests/compositing/regions/fixed-in-named-flow-got-transformed-parent-expected.txt', u'LayoutTests/compositing/regions/fixed-in-named-flow-got-transformed-parent.html', u'LayoutTests/compositing/regions/fixed-in-named-flow-lost-transformed-parent-expected.txt', u'LayoutTests/compositing/regions/fixed-in-named-flow-lost-transformed-parent.html', u'LayoutTests/compositing/regions/fixed-in-named-flow-overlap-composited-expected.txt', u'LayoutTests/compositing/regions/fixed-in-named-flow-overlap-composited.html', u'LayoutTests/compositing/regions/fixed-in-named-flow-position-changed-expected.html', u'LayoutTests/compositing/regions/fixed-in-named-flow-position-changed.html', u'LayoutTests/compositing/regions/fixed-in-named-flow-transformed-parent-expected.txt', u'LayoutTests/compositing/regions/fixed-in-named-flow-transformed-parent.html', u'LayoutTests/compositing/regions/fixed-in-named-flow-zIndex-expected.html', u'LayoutTests/compositing/regions/fixed-in-named-flow-zIndex.html', u'LayoutTests/compositing/regions/fixed-in-named-flow.html', u'LayoutTests/compositing/regions/fixed-transformed-in-named-flow-expected.txt', u'LayoutTests/compositing/regions/fixed-transformed-in-named-flow.html', u'LayoutTests/fast/regions/repaint/element-in-named-flow-absolute-from-fixed.html', u'LayoutTests/fast/regions/repaint/element-in-named-flow-fixed-from-absolute.html', u'LayoutTests/fast/regions/repaint/element-inflow-fixed-from-outflow-static.html', u'LayoutTests/fast/regions/repaint/element-outflow-static-from-inflow-fixed.html', u'Source/WebCore/ChangeLog', u'Source/WebCore/rendering/RenderFlowThread.cpp', u'Source/WebCore/rendering/RenderLayerCompositor.cpp', u'Source/WebCore/rendering/RenderLayerCompositor.h', u'Source/WebCore/rendering/RenderNamedFlowFragment.h', u'Source/WebCore/rendering/RenderNamedFlowThread.h', '--commit-queue']" exit_code: 1 ERROR: Source/WebCore/rendering/RenderLayerCompositor.h:345: The parameter name "overlapMap" adds no information, so it should be removed. [readability/parameter_name] [5] Total errors found: 1 in 36 files If any of these errors are false positives, please file a bug against check-webkit-style.
Created attachment 221267 [details] Patch 2 Same patch but try to make style checker happy.
Comment on attachment 221267 [details] Patch 2 r=me
Created attachment 221335 [details] Patch for landing
Comment on attachment 221335 [details] Patch for landing Clearing flags on attachment: 221335 Committed r162117: <http://trac.webkit.org/changeset/162117>
All reviewed patches have been landed. Closing bug.