GNU bug report logs - #29461
Wishlist: better facilities for debugging undo problems

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From: Noam Postavsky <npostavs@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: Wishlist: better facilities for debugging undo problems
References: <CAJr1M6c-V9MuwBtL3waptOMkMh5JUpFzxu-BGjGXCGdgmwh=mg@HIDDEN>
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Date: Sun, 26 Nov 2017 14:59:58 -0500
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Severity: wishlist

See also https://debbugs.gnu.org/cgi/bugreport.cgi?bug=29118#21

To make debugging trouble with undo easier, it would nice to have a way
to "replay" and "rewind" operations to easily see what they do.  And a
way to visualize the meaning of undo list elements without actually
"playing" them, as it's hard to see what a pair of buffer positions
refers to at a glance.

I've written some crude visualization code for markers under
elpa/packages/yasnippet/yasnippet-debug.el.