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Syntactic fontification of diff hunks

From: Juri Linkov
Subject: Syntactic fontification of diff hunks
Date: Fri, 17 Aug 2018 00:08:16 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu)

Most version control sites like gitlab/github highlight syntax
in code snippets inside diff hunks, for example:

This is very helpful when looking at code changes.  I missed this feature in 
for a long time.  This is why I asked a question about a possible 
implementation in
but no one had an answer.

Then I realized that much simpler would be just to use the same approach
implemented by diff-mode refinement, i.e. to take each diff hunk one by
one, and like the diff refinement highlights more fine-grained changes,
do the same for syntax highlighting according to the language in
compared files/commits.

You can see the result at the following screenshot:

PNG image

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