https://bugs.webkit.org/show_bug.cgi?id=120726

Reviewed by Ryosuke Niwa.

Source/WebCore:

When moving from one text node to the other, while deleting characters,
the deleted text node's style was being applied to any new characters
added into the existing text node.

Typing Style in the frame selection maintains the editing style for the
deleted text node, so that if new characters are inserted at the position
of the deleted text node, it's style can be applied to them.

However, when moving into another text node, we should reset or clear the
typing style maintained by the frame selection. This ensures that any new
content inserted within the existing node does not take on any uncleared
style of the deleted node.

Test: editing/deleting/maintain-style-after-delete.html

* editing/DeleteSelectionCommand.cpp:
(WebCore::DeleteSelectionCommand::saveTypingStyleState):
Calling clearTypingStyle() on frame selection whenever deletion occurs
within the same text node. Thus any existing typing styleh held by the
frame selection shall be cleared.

LayoutTests:

* editing/deleting/maintain-style-after-delete-expected.txt: Added.
* editing/deleting/maintain-style-after-delete.html: Added.
Testcase added for verifying that style of the text node being deleted
is maintained.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@155425 268f45cc-cd09-0410-ab3c-d52691b4dbfc