bug#37472: 26.2; completion-kill-region breaks rectangle-mark-mode

[Jens Lautenbacher]

When using dynamic completion, rectangle-mark-mode is broken, in so far
as C-w no longer respects just killing the rectangle but instead kills
the usual full (non-rectangular) region.

M-w on the other hand works, because it is the original function, while
C-w is overloaded with completion-kill-region.

To test: try C-w after C-x SPC once bound to kill-region and once bound
to completion-kill-region (or simply M-x the two functions with an
active rectangular region).

I have "fixed" it in my init.el in the following hackish way:

(add-hook 'rectangle-mark-mode-hook
      (lambda ()
        (if rectangle-mark-mode ;; entering...
            (if (not dynamic-completion-mode)
                (setq restore--dyncomplete nil)
              (setq restore--dyncomplete t)
              (dynamic-completion-mode -1))
          ;; ...else leaving
          (if restore--dyncomplete
              (dynamic-completion-mode t)))))

but this seems pretty clumpsy - actually so much that I removed it
again
and just shut off dynamic completion completely...



In GNU Emacs 26.2 (build 1, x86_64-redhat-linux-gnu, GTK+ Version
3.24.10)
 of 2019-07-25 built on buildvm-26.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.12005000
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