https://bugs.webkit.org/show_bug.cgi?id=106287

Reviewed by Hajime Morita.

.:

* Source/autotools/symbols.filter:

Source/WebCore:

When an input element is disabled or readonly, its inner element is not editable. So its rootEditableElement
does not exist. In WebViewImpl::caretOrSelectionRange, if rootEditableElement does not exist, it uses
a document element. However, the inner element and document element have a different tree scope, the selection range
cannot be gotten correctly.

We should use ShadowRoot instead of document so that we can stay in the same tree scope.

* WebCore.exp.in:
* editing/FrameSelection.cpp:
(WebCore::FrameSelection::rootEditableElementOrTreeScopeRootNode): Added. Returns ShadowRoot so that we can
stay in the same tree scope.
(WebCore):
* editing/FrameSelection.h:
(FrameSelection):
* editing/TextIterator.cpp:
(WebCore::TextIterator::getLocationAndLengthFromRange):
* editing/TextIterator.h:
(TextIterator):

Source/WebKit/chromium:

When an input element is disabled or readonly, its inner element is not editable. So its rootEditableElement
does not exist. In WebViewImpl::caretOrSelectionRange, if rootEditableElement does not exist, it uses
a document element. However, the inner element and document element have a different tree scope, selection range
cannot be gotten correctly.

We should use ShadowRoot instead of document so that we can stay in the same tree scope.

* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::caretOrSelectionRange):
* tests/WebViewTest.cpp:
* tests/data/selection_disabled.html: Added.
* tests/data/selection_readonly.html: Added.

Source/WebKit/win:

* WebKit.vcproj/WebKitExports.def.in:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141196 268f45cc-cd09-0410-ab3c-d52691b4dbfc