InsertUnorderedList can lead to lost content and assertions in moveParagraphs
https://bugs.webkit.org/show_bug.cgi?id=111228

Reviewed by Ryosuke Niwa.

Source/WebCore:

When a list is wrapped in a presentational inline like a b tag, we'd create markup that included
everything up to the b tag from moveParagraphs when intending to only move the contents of the
list item. This could make it impossible to remove content from a list and trigger loss of
editable text.

Test: editing/execCommand/insert-remove-block-list-inside-presentational-inline.html

* editing/EditingStyle.cpp:
(WebCore::elementMatchesAndPropertyIsNotInInlineStyleDecl): Ensure there's an inline style
before calling propertyExistsInStyle.
(WebCore::HTMLElementEquivalent::propertyExistsInStyle): Removing null check for style.
All callers ensure this value isn't null.
* editing/markup.cpp:
(WebCore::highestAncestorToWrapMarkup): Avoid going over RenderBlocks when finding the highest
presentational ancestor to avoid leaving the bounds of the original paragraph.

LayoutTests:

* editing/deleting/pruning-after-merge-1-expected.txt:
* editing/execCommand/insert-remove-block-list-inside-presentational-inline-expected.txt: Added.
* editing/execCommand/insert-remove-block-list-inside-presentational-inline.html: Added.
* editing/pasteboard/paste-and-sanitize-expected.txt:
* editing/pasteboard/paste-and-sanitize.html:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144995 268f45cc-cd09-0410-ab3c-d52691b4dbfc