Allow viewing a given version of a file from the log page

[spearce]

Originally reported on Google Code with ID 49

When looking at a log of a particular file (say https://chromium.googlesource.com/chromium/src/+log/master/chrome/browser/chrome_browser_main.cc),
there should be a way to jump directly to what that particular file looked like at
any given version.

Something that I frequently do before looking at the blame for a given version is to
scan the list of changes that touch a file until I find something that is relevant
and then take it from there.

In fact, maybe I rely on that functionality from http://src.chromium.org/viewvc even
more than actual blame.

Reported by None on 2014-05-05 11:32:22

[spearce]

When looking at a log of a particular file (say https://chromium.googlesource.com/chromium/src/+log/master/chrome/browser/chrome_browser_main.cc),
there should be a way to jump directly to what that particular file looked like at
any given version.

Something that I frequently do before looking at the blame for a given version is to
scan the list of changes that touch a file until I find something that is relevant
and then take it from there.

In fact, maybe I rely on that functionality from http://src.chromium.org/viewvc even
more than actual blame.

Reported by None on 2014-05-05 11:32:22

[spearce]

Agreed, analogous to how we have extra [blame] links on the /+diff page when the path
is a single file.

(Sorry that log page is so slow BTW...just learned today JGit is about 20x slower than
C git on log of a file.)

Reported by None on 2014-05-05 11:48:45