commit 52d55d36c78e4772e0e3499409dc6f6dcabde00e
author Yoshifumi Inoue <yosin@chromium.org> Thu Oct 05 08:59:01 2017
committer Commit Bot <commit-bot@chromium.org> Thu Oct 05 08:59:01 2017
tree b2f535898e550feb9257d91fe44d7711258b5dea
parent 4a3dd816b81f097697bce64b6e8b14e5e288e5bf

Make InsertText command not to split SPAN element containing TAB character

Before this patch, "InsertText" command splits SPAN element containing TAB
character when inserting text into it.

For example:
Before: <span>&#9;a|c</span>
Command: insertText "B"
After: <span>&#9;a</span>B|<span>c</span>

This behavior is introduced by the patch[1], which replaces
"class=apple-tab-span" to "style=white-space:pre".

This patch changes |IsTabHTMLSpanElement()| to check "white-space:pre" CSS
property to make "InsertText" command not to split SPAN element containing
TAB character with "white-space: pre".


Note: "apple-tab-span" CSS class is MacOS specific feature[2]. On MacOS,
UITextView puts following HTML into pasteboard:

<style>.Apple-Tab-Span { white-space: pre; }</style>
<span class=Apple-Tab-Span>&#9;</span>

[1] http://crrev.com/2718543003 Remove EditingAppleTabSpan class handling
[2] https://www.cocoanetics.com/2013/06/apple-tab-span/

Bug: 741826
Change-Id: I42d8d388e306b613fbe8ffa614b9e974db254c22
Reviewed-on: https://chromium-review.googlesource.com/697044
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506683}