https://bugs.webkit.org/show_bug.cgi?id=68543

https://bugs.webkit.org/show_bug.cgi?id=68543

Make sure that when regions change dimensions we recompute pagination slices.

Reviewed by Simon Fraser.

Source/WebCore:

Added new tests in fast/regions.

* rendering/LayoutState.cpp:
(WebCore::LayoutState::LayoutState):
* rendering/LayoutState.h:
* rendering/RenderFlowThread.cpp:
(WebCore::RenderFlowThread::layout):
(WebCore::RenderFlowThread::renderRegionForLine):
(WebCore::RenderFlowThread::regionLogicalWidthForLine):
* rendering/RenderRegion.cpp:
(WebCore::RenderRegion::layout):
* rendering/RenderView.cpp:
(WebCore::RenderView::pushLayoutState):
* rendering/RenderView.h:
(WebCore::LayoutStateMaintainer::LayoutStateMaintainer):
(WebCore::LayoutStateMaintainer::push):

LayoutTests:

* fast/regions/text-region-split-after-resize-expected.txt: Added.
* fast/regions/text-region-split-after-resize.html: Added.
* fast/regions/webkit-flow-floats-inside-regions-bounds-expected.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95648 268f45cc-cd09-0410-ab3c-d52691b4dbfc