GNU bug report logs - #48356
28.0.50; choose-completion discards the suffix after the completion boundary

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Daniel Mendler <mail <at> daniel-mendler.de>
To: bug-gnu-emacs <at> gnu.org
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, JD Smith <jdtsmith <at> gmail.com>
Subject: 28.0.50; choose-completion discards the suffix after the completion
 boundary
Date: Tue, 11 May 2021 19:23:13 +0200

When selecting a candidate the suffix after the completion boundary is
discarded by `choose-completion`/`choose-completion-string`.
`choose-completion` is invoked when a candidate in the *Completions*
buffer is selected with the mouse or RET.

For example when completing a file path "~/emacs/master/li|/calc", where
"|" is the cursor, and then the candidate "lisp" is selected in the
*Completions* buffer, the result is "~/emacs/master/lisp/". The prefix
"~/emacs/master/" is prepended to the selected candidate, but the suffix
"/calc" is discarded.

`choose-completion-string` contains logic which checks if the resulting
string equals the car of the completion boundary. In that case the
minibuffer is not exited.

I propose the following change to the existing logic: When
selecting a candidate with `choose-completion` and a suffix is present,
the minibuffer should not be exited (completion continues) and the
suffix is preserved.

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