Display diff using side by side presentation about gitiles HOT 10 CLOSED

Similar to how Gerrit formats a file side by side, allow viewing a modified text file
in a side by side view.

Gerrit's method of rendering this in a 4 column table with each line being a new row
is horrid and should be replicated. Critique and GitHub get this more right by rendering
4 divs in a 1 row table, enabling the user to select a contiguous section of source
code from either side.

I don't really want to reinvent the wheel here. IMHO we should reuse the side by side
diff logic from Gerrit, but of course that's currently impossible because Gerrit uses
GWT, and does various other things wrong. So, first let's fix Gerrit.

Gerrit is looking at moving to Codemirror for side-by-side diffs. We should do that
too: not too much fancy JS, hopefully largely pasting it in, I haven't looked. Even
if not, we should be able to reuse more code because it's just the server-side stuff
(serving diff info), no more GWT.

For reference, I requested this via email as something that I think is important for
parity between ViewVC and gitiles if Chromium is moving from the former to the latter.

Can/should it be optional? I personally prefer the single format.

Any update on the prospects for this?

Issue chromium:384604 has been merged into this issue.

Nope. :(

IIRC we tried using CodeMirror3 and it was too slow/awkward to use for Chromium project.
So a new side by side view needs to be built from scratch in Gitiles, but that work
hasn't been estimated or scheduled.

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