Bug: org-clock-select-task reuses reserved characters [9.3 (release_9.3 @ /home/unhammer/PREFIX/emacs/share/emacs/28.0.50/lisp/org/)]

Bug: org-clock-select-task reuses reserved characters [9.3 (release_9.3 @ /home/unhammer/PREFIX/emacs/share/emacs/28.0.50/lisp/org/)]

[Kevin Brubeck Unhammer]

Remember to cover the basics, that is, what you expected to happen and
what in fact did happen.  You don't know how to make a good report?  See

     https://orgmode.org/manual/Feedback.html#Feedback

Your bug report will be posted to the Org mailing list.
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If your org-clock-history has 44 or more elements, then the "c"
character will no longer go to the current task, but to the 44th clocked
in task. Similarly for [d]efault and [i]nterrupted.

The function first adds (?c . marker-to-current-task) to the sel-list,
then goes through org-history and uses 0-9 and A-Z and then keeps going
through lower case letters without caring about whether the letter was
already in there.


Emacs  : GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo version 1.16.0)
 of 2020-08-27
Package: Org mode version 9.3 (release_9.3 @ /home/unhammer/PREFIX/emacs/share/emacs/28.0.50/lisp/org/)