bug#46990: 28.0.50; popup menu not navigable via arrow keys on lucid build

[Colin Baxter]

>>>>> martin rudalics <rudalics@gmx.at> writes:

    >> 1. make clean and make distclean 2. ./configure
    >> ---x-toolkit=lucid <RET> 3. make <RET> 4. src/emacs -Q <RET>
    >> 5. Remove menu-bar by eval (menu-bar-mode -1) <RET> 6. <F10>
    >> 7. popup menu appears 8. popup menu navigable via mouse but not
    >> via arrow keys.  9. End
    >> 
    >> 
    >> 
    >> 
    >> 
    >> In GNU Emacs 28.0.50 (build 1, i686-pc-linux-gnu, X toolkit,
    >> cairo version 1.14.8, Xaw3d scroll bars) of 2021-03-07 built on
    >> bluestar Repository revision:
    >> 8558ecd65fc1c87345353f6352299df04280e729 Repository branch:
    >> master System Description: Debian GNU/Linux 9 (stretch)
    >> 
    >> Configured using: 'configure --with-x-toolkit=lucid'

    > Works here but is broken for motif.  If the breakage is recent,
    > you will have to bisect.

Thanks. Rather than bisect I cloned a fresh emacs. I still get the same
issue: menu works with mouse but not arrow keys. What would a bisect do
that a fresh clone doesn't?

Best wishes,