Formerly, diff content elements mixed text with comment threads. For
example, a diff content node with an intraline highlight, a ranged
comment, and a gr-diff-comment-thread may have been organized as below:
TD.content
╠ #text
╠ HL (intraline difference)
║ ╚ #text
╠ #text
╠ HL.range (ranged comment highlight)
║ ╚ #text
╠ #text
╚ GR-DIFF-COMMENT-THREAD
╠ GR-DIFF-COMMENT
╚ ...
Note that the comment thread was inserted at the same level as the text
of the diff line.
With this change, the text is separated from the comment thread by
introducing a DIV to contain the text with class `contentText` as
sibling to comment threads.
TD.content
╠ DIV.contentText
║ ╠ #text
║ ╠ HL
║ ║ ╚ #text
║ ╠ #text
║ ╠ HL.range
║ ║ ╚ #text
║ ╚ #text
╚ GR-DIFF-COMMENT-THREAD
╠ GR-DIFF-COMMENT
╚ ...
Modifies the `getContentByLine` method of gr-diff-builder to return the
`DIV.contentText` element rather than the `TD.content` element which is
its parent. In most uses of this function, the text is what is needed
rather than the TD or comment thread, but in other cases, they can be
easily DOM traversed.
Change-Id: I0eded34afd3d22963252efc7eabfee290ae21a9c
025e65d7d5