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Re: Recent diff-mode changes feel slow with TRAMP

From: Stefan Monnier
Subject: Re: Recent diff-mode changes feel slow with TRAMP
Date: Sun, 13 Jan 2019 22:31:35 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

>> Maybe it should be disabled by default in remote buffers.
> When a remote host is fast, it's a big advantage that TRAMP supports
> this feature without any efforts.  But when a remote host is slow,
> it should be disabled indeed.
> I can't confirm what effect is has on slow connections because all my
> remote connections are so fast that I don't notice any difference
> between remote and local.

Do you think it would be possible to provide a fast/local option for
diff-font-lock-syntax which doesn't fetch the base file but still
performs some syntax-highlighting (e.g. just take the hunk's text into
a temp buffer, put it in the appropriate major mode and
call font-lock-ensure; maybe bailing out if the end of the hunk is
taken to be within a string, in which case maybe the whole highlighting
was done wrong because maybe it was the beginning of the hunk which was
inside a string)?

It could also be used in those cases where you're looking at a diff "out
of context" (so the base file can't be fetched)?


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