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Ticket 88: https://dev.gitblit.com/tickets/gitblit.git/88
Based on Lea Verou's pure CSS slider:
http://lea.verou.me/2014/07/image-comparison-slider-with-pure-css/
* Add a callback interface, pass it through DiffUtils to the
GitBlitDiffFormatter. Is needed because the rendering needs access
to the repositoryName and other things that are known only at higher
levels.
* New class ImageDiffHandler responsible for rendering an image diff.
Called for all binary diffs, doesn't do anything if it's not an
image. HTML is generated via JSoup: no worries about forgetting to
close a tag, not about HTML escaping, nor about XSS.
* The 3 diff pages set up such an ImageDIffHandler and pass it along.
* CSS changes: from Lea Verou, with some minor improvements.
I think in the long run there'll be no way around rewriting the
HTML diff formatter from scratch, not using the standard JGit
DiffFormatter at all.
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