bug#29599: 26.0; `dframe.el' binds keys unconditionally when loaded

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bug#29599: 26.0; `dframe.el' binds keys unconditionally when loaded

Drew Adams
Well, not completely unconditionally.  But I see this:

(if (boundp 'special-event-map)
      (define-key special-event-map [make-frame-visible]
      (define-key special-event-map [iconify-frame]
      (define-key special-event-map [delete-frame]

That condition that the map exists isn't, I think, sufficient to give it
license to bind keys in the map.

I must have done something after my init file was loaded that required
`dframe.elc' to be loaded, and that load overwrote bindings I made in my
init file.

I don't know what I did that caused dframe to be loaded, but that
shouldn't matter.  I don't think it should overwrite key bindings
just by being loaded.

In my init file I do this (after loading library `thumb-frm.el', which
defines `thumfr-thumbify-frame-upon-event'):

(when (and (eq system-type 'windows-nt)
           (fboundp 'thumfr-thumbify-frame-upon-event))
  (define-key special-event-map [iconify-frame]

But dframe.el overwrites that binding when it gets loaded.

Shouldn't dframe.el bind its own commands to `special-event-map' keys
only if those keys are not already bound?

I don't know what it's doing or why, but this doesn't seem very polite
of it.  Why should it think that just by being loaded it should
(re-)bind keys?

In GNU Emacs 26.0.90 (build 3, x86_64-w64-mingw32)
 of 2017-10-13
Repository revision: 906224eba147bdfc0514090064e8e8f53160f1d4
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''