29.0.50; Add command for refilling ERC buffers

[J.P.]

Tags: patch

A recent bug entitled

  bug#51841: 27.2; erc-insert-marker has no value

(opened by Libera user Bost) was in part brought about by confusion over
whether ERC already offered this feature and perhaps applied it during
major-mode setup. While I don't think erc-stamp and erc-fill currently
provide sufficient support to rig up automated refilling in a reliable
way (on window configuration change, for example), I agree that some
means of doing so manually might occasionally come in handy.

A related issue concerns the purpose and treatment of the option
`erc-fill-prefix'. This one's a mystery to me and seems to have little
meaningful bearing on anything. It does make an appearance in
erc-button.el, but to what end I'm not entirely certain. Like a few
other puzzlers, it was present in much the same form back when ERC was
first ported to ye old CVS some twenty years ago (almost to the day)
[1]. Anyway, I will continue to investigate this. Thanks.


[1] 
https://gitlab.com/jpneverwas/og-erc/-/commit/9a819366bdf8a6f5a304916baa2d6a501eb3987b#4042b2fc4c564fbd556343d1ed666da630f85951_0_97

In GNU Emacs 29.0.50 (build 1, x86_64-redhat-linux-gnu, GTK+ Version 3.24.30, 
cairo version 1.17.4)
 of 2021-11-18 built on localhost
Repository revision: 69f1bc43c026049ed2aab6a6368e2e9a5406b779
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Fedora 34 (Workstation Edition)

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0001-Add-command-to-refill-ERC-buffers.patch
Description: Text Data