bug#57434: 28.1.91; Terminal Emacs Mac OS flickering.

[Eli Zaretskii]

> From: Dmitrii Kuragin <kuragin@google.com>
> Date: Mon, 29 Aug 2022 13:25:06 -0700
> Cc: Gerd Möllmann <gerd.moellmann@gmail.com>, 
>       57434@debbugs.gnu.org
> 
> :~/Desktop% tput al; echo $?
> 0
> :~/Desktop% tput AL; echo $?
> 1%dL0
> :~/Desktop% tput dl; echo $?
> 0
> :~/Desktop% tput DL; echo $?
> 1%dM0
> :~/Desktop% tput sf; echo $?
> 
> 0
> 0~/Desktop% tput sr; echo $?
> :~/Desktop% tput wi; echo $?
> tput: unknown terminfo capability 'wi'
> 4
> :~/Desktop% tput cs; echo $?
> %p1%d;%p2%dr0
> :~/Desktop% tput cS; echo $?
> tput: unknown terminfo capability 'cS'
> 4
> ```
> 
> Seems like Mac Os doesn't support "wi", but the condition is still going to 
> be true.

Emacs is supposed to use the alternative capabilities, as follows from
the condition for line_ins_del_ok flag to be set.  Does it indeed use
the other alternatives?