bug#51561: 29.0.50; overlay keymaps do not respect mouse-1 logic

[Lars Ingebrigtsen]

Putting follow-link in a keymap is supposed to make
mouse-1-click-follows-link do its thing.

(progn
  (insert "hello")
  (let ((o (make-overlay (- (point) 5) (point))))
    (overlay-put o 'help-echo "Click to hide")
    (overlay-put o 'keymap
                 (define-keymap
                   [follow-link] 'mouse-face
                   [mouse-2] (lambda () (interactive) (message "click"))))))

But it doesn't.


In GNU Emacs 29.0.50 (build 107, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, 
cairo version 1.16.0)
 of 2021-10-31 built on elva
Repository revision: b75e79138cbafd804f83bcea96c0754f468a8075
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux bookworm/sid


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(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no