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Problem quitting properly from transient keymap with one keystroke

From: Bob Weiner
Subject: Problem quitting properly from transient keymap with one keystroke
Date: Wed, 18 Oct 2017 23:13:41 -0400

I am using set-transient-map to create an overriding keymap that
provides quick access to frame and window functions.  I have both a
stay-in-transient-map function and an on-exit function defined that
are sent as parameters to the set-transient-map call.

Everything is working as desired except for disabling the transient map.
Both C-g and q should disable the transient map and run the on-exit
function I have defined.  I am using inhibit-quit set to t to
control the operation of C-g.  Both C-g and q set a flag which informs
the stay-in-transient-map function to disable the keymap.  The on-exit
function then is called after the keymap is disabled and for C-g,
(keyboard-quit) is called.

The problem is that set-transient-map uses pre-command-hook to test the
stay-in-transient-map function and to exit, so if a keystroke sets the
flag read by the stay-in-transient-map function to disable the transient
map, this check is not done until another key is pressed because the
pre-command-hook is not run again until then (so the code doesn't see
the flag change until then).

I can't just add a post-command-hook that calls the transient map
disable function because calling (keyboard-quit) from the
post-command-hook triggers an error and I imagine that is not a proper
usage scenario.

Is there any clean way to exit and abort from a transient keymap upon a
single key press?  I have tried manually invoking (from the
post-command-hook) the disable function that set-transient-keymap
returns, but have not gotten that to work either.

FYI, when I mention a key, I mean a bound key within the current keymaps.



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