bug#38828: 26.3; Customized mode line breaks height of vertical scroll bar

[Eli Zaretskii]

> Date: Thu, 02 Jan 2020 21:58:49 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 38828@debbugs.gnu.org
> 
> But I now think that we need to reset the mode_line_p flag even if we
> reallocate, because the rows which existed before reallocation are
> copied to the enlarged matrix, so that flag is kept.  So I think I
> will install the patch with that small change.

Done, and closing the bug.

Thanks for the test cases and the feedback.