https://bugs.webkit.org/show_bug.cgi?id=93170

Patch by Takashi Sakamoto <tasak@google.com> on 2012-10-05
Reviewed by Abhishek Arya.

Source/WebCore:

The bug is caused by RenderInline::styleDidChange's setContinuation(0).
RenderObjectChildList uses continuation to know whether the given
renderer should have AFTER render object or not.
However, setContinuation(0) makes RenderObjectChildList to
misunderstand that all continuations are last continuation.
To avoid the misunderstanding, added a new flag to class
RenderObejctChildList to enable/disable updating :after content (and
also :before content).

Tests: fast/css-generated-content/after-with-inline-continuation.html
       fast/css-generated-content/dynamic-apply-after-for-inline.html

* rendering/RenderInline.cpp:
(WebCore::RenderInline::styleDidChange):
Disable upating :after content for continuations which are not
the last one during setStyle just after setContinuation(0).
The setStyle invokes RenderInline::styleDidChange and also invokes
updateBeforeAfterContent via the styleDidChange. This means,
the last continuation's updateBeforeAfterContent is also invoked
after setContinuation(0). We have to update :after for the last
continuation.
* rendering/RenderObjectChildList.cpp:
(WebCore):
(WebCore::RenderObjectChildList::updateBeforeAfterContent):
If s_updateBeforeAfterContent is false, quickly exit
updateBeforeAfterContent.
* rendering/RenderObjectChildList.h:
(RenderObjectChildList):
Added a new flag s_enableUpdateBeforeAfterContent to enable/disable
updating :before or :after content.

LayoutTests:

* fast/css-generated-content/after-with-inline-continuation-expected.html: Added.
* fast/css-generated-content/after-with-inline-continuation.html: Added.
* fast/css-generated-content/dynamic-apply-after-for-inline-expected.html: Added.
* fast/css-generated-content/dynamic-apply-after-for-inline.html: Added.
* http/tests/misc/acid3-expected.txt:
The acid3-expected.txt has the duplicate RenderBlock (positioned).
Two 'layer at(638, 18) size 20x20, ... text run at (0,0) width 20: "X"'
exist. So did reset-results for acid3-expected.txt.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@130555 268f45cc-cd09-0410-ab3c-d52691b4dbfc