REGRESSION (r104445): Style is not recomputed on serenaandlily.com

REGRESSION (r104445): Style is not recomputed on serenaandlily.com
https://bugs.webkit.org/show_bug.cgi?id=83663

Source/WebCore:

Reviewed by Andreas Kling.

CSS class and id selectors are case insensitive in non-strict modes. The code
that invalidated the scope elements used getElementByID() which is case
sensitive in all modes. As a result we would fail to invalidate elements
that would match a style rule but used different case in id.

The new code invalidates by crawling the DOM tree. This often (when there are classes)
actually faster than the existing code as we can now handle everything in a single pass.
Each class scope required a crawl with the old code.

The code uses the same functions as the selector matching code to get the same behavior.

The maximum class limit is lifted as number of classes does not affect complexity anymore.

Test: fast/css/id-or-class-before-stylesheet-strict.html

* css/SelectorChecker.h:
(WebCore::SelectorChecker::elementMatchesSelectorScopes):
(WebCore):
* dom/Document.cpp:
(WebCore::Document::testAddedStylesheetRequiresStyleRecalc):
(WebCore):

LayoutTests:

Reviewed by Andreas Kling.

Update the existing test with case insensitive comparisons and add a strict mode test.

* fast/css/id-or-class-before-stylesheet-expected.txt:
* fast/css/id-or-class-before-stylesheet-strict-expected.txt: Added.
* fast/css/id-or-class-before-stylesheet-strict.html: Added.
* fast/css/id-or-class-before-stylesheet.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114265 268f45cc-cd09-0410-ab3c-d52691b4dbfc