There was an issue where line numbers would not properly highlight in
inline-diffs rendered in the file view.
There were two separate issues that contributed to this problem:
1 - The diff cursor was not notified of the line being selected and
needing to move to that cursor stop.
2 - The diff cursor was not properly updated after being moved inside
a dom-if statement.
Additionally, the way that line selection was previously done was not
extendable to a diff cursor that stored multiple files. It queried
stops based on line number and side. This change also stores the
path of the file in the cursor stop so that the correct diff/line is
selected in the case of multiples.
Bug: Issue 5977
Change-Id: I7496293e19a4e59a3855dc78e273de6a9852e556
eccee3ce49