bug#40992: 27.0.90; Evaluating a function while using edebug breaks

[Alan Mackenzie]

Bug fixed in the emacs-27 branch by reverting commit

commit e8b3a15cb6ff187ce08afcb43bd9a0b7907268ca
Author: Lars Ingebrigtsen <larsi@gnus.org>
Date:   Sun Oct 20 12:07:42 2019 +0200

    Mark breakpoints in edebug with highlights

    * lisp/emacs-lisp/edebug.el (edebug--overlay-breakpoints)
    (edebug--overlay-breakpoints-remove): New functions (bug#23468).
    (edebug-modify-breakpoint): Use them to highlight breakpoints.
    (edebug--display-1): Restore breakpoint highlights.
    (edebug--recursive-edit): Remove highlights on exit.

-- 
Alan Mackenzie (Nuremberg, Germany).