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[PATCH] `completing-read`: Add `group-function` support to completion me

From: Daniel Mendler
Subject: [PATCH] `completing-read`: Add `group-function` support to completion metadata
Date: Sun, 25 Apr 2021 15:32:19 +0200

I attached a patch which adds grouping support to the completions buffer. The completion table can specify a `group-function` via its completion metadata.

Currently groups are only displayed in the *Completions* buffer if `completions-format=one-column`. My proposal is to split up the function `completion--insert-strings` into three functions `completion--insert-strings-one-column/vertical/horizontal` in a follow-up patch. Then the grouping display can also be implemented for the other display formats.

Group title support is already present in the Vertico, Selectrum and external Icomplete-vertical UI. Similarly we can add support to the recently added `icomplete-vertical-mode` by Gregory.

There is a patch to `xref.el` included, which makes use of the grouping functionality, when the `completing-read` show function is used:

(setq xref-show-xrefs-function #'xref-show-definitions-completing-read)


Attachment: 0001-completing-read-Add-group-function-to-completion-met.patch
Description: Text Data

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