Re: Question about child frames + menu bar

["Gerd Möllmann" <gerd.moellmann@gmail.com>]

martin rudalics <rudalics@gmx.at> writes:

>> Do you perhaps remember what this change was about? I read the bug that
>> the commit message references but couldn't figure out how this bug is
>> related. Or, maybe, is there something special about menu bars on child
>> frames, like they may not have a menu bar, or something?
>
> As far as this change for the selected frame case
>
> -      update_menu_bar (sf, true, false);
> +
> +      if (!FRAME_PARENT_FRAME (sf))
> +	update_menu_bar (sf, true, false);
>
> is concerned, I can only guess that when I tried to fix the bug above I
> noticed that we did call update_menu_bar for the case that the selected
> frame is a child frame and tried to avoid that.  The rationale was that
> when I implemented child frames, I noticed that menu bars don't work
> with child frames under X while they worked well on MS Windows.  Now at
> that time there was a strict policy that we were not allowed to
> implement features that worked on non-free systems only.  So I switched
> off menu bars in child frames everywhere and made the change above to be
> on the safe side.

Thanks, that explains it, I guess, although on macOS child frames seem
to support menus, heaven knows how that works.

> If you want to implement menu bars on TTY child frames, you probably
> will have to special case that here and maybe in other places as well.

Hm, not sure what I should do.

On one hand, I could suppress the menu bar on chlid frames in some way,
which would hopefully be easy (haven't looked, but maybe not accepting
menu-bar-lines changes to non-zero.

Or I could make the condition "!PARENT_FRAME || on tty" plus fix the
menu position bug. Should also not be too difficult I guess, but a bit
more work.

Any preferences, anyone?