bug#15575: 24.3.50; New tty menus crash Emacs

[Stefan Monnier]

>     Btw, did you compile with --enable-checking, i.e. were the 3 eassert
>     statements at the beginning of deep_copy_glyph_row compiled into the
>     program?
> No, I did not. I usually don't because the checkings more often than not
> trip on something that really isn't a bug. I've never caught a real error
> with it.

I've been running with --enable-checking for "ever".  Of course, there
can be lots of situations where you'd bump into cases that I will never
encounter, but those should be fixed as well.

So, please use --enable-checking and report the false positives so we
can fix them.


        Stefan