bug#54289: 29.0.50; Emacs ignores xmodmap Super_L assignment

[Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Stephen Berman <stephen.berman@gmx.net> writes:

> xmodmap:  up to 4 keys per modifier, (keycodes in parentheses):
>
> shift       Shift_L (0x32),  Shift_R (0x3e)
> lock
> control     Control_L (0x25),  Control_L (0x42),  Control_R (0x69)
> mod1        Alt_L (0x40),  Meta_L (0xcd)
> mod2        Num_Lock (0x4d)
> mod3
> mod4        slash (0x85),  Super_R (0x86),  slash (0xce),  Hyper_L (0xcf)
> mod5        ISO_Level3_Shift (0x5c),  Mode_switch (0xcb)
>
> I ran `xmodmap .Xmodmap' with those lines added and then ran just
> xmodmap, getting the above ouput.  This is identical to the output of
> xmodmap I sent previously, without the added lines from you.  Do the
> added lines need to be in a particular order with respect to the
> existing lines?  Currently my .Xmodmap has these uncommented lines, in
> the order listed:
>
> remove Lock      = Caps_Lock
> keysym Caps_Lock = Control_L
> add    Control   = Control_L
> remove mod4 = Super_R
> remove mod4 = Hyper_L
> remove mod4 = slash
> keysym Super_L = slash
> keysym Menu = backslash
>
> Steve Berman

What happens if you run this command after loading the .Xmodmap file?

  $ xmodmap -e 'remove mod4 = Super_R' -e 'remove mod4 = Hyper_L' -e \
  'remove mod4 = slash'

Thanks.