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improve gud-gdb completion

From: Stephen Leake
Subject: improve gud-gdb completion
Date: Wed, 28 Jul 2021 07:13:12 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (windows-nt)

I'd like to improve completion in gud-gdb.

Currently, it completes on names in the buffer being debugged, but it
doesn't include "." in the name, so if I'm trying to print
"Incremental_Parser.Parse_Errors.Length", it only completes to

However, I can't figure out exactly what elisp code is harvesting names
from the buffer.

TAB is bound to completion-at-point.

completion-at-point-functions is
(gud-gdb-completion-at-point comint-completion-at-point t)

(default-value 'completion-at-point-functions) is

None of those completion functions look at the text in buffers.

What am I missing?

-- Stephe

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