> Date: Sun, 8 Sep 2024 16:43:54 +0200 > Cc: Eli Zaretskii <e...@gnu.org>, 73...@debbugs.gnu.org > From: martin rudalics <rudal...@gmx.at> > > > In cmcheckmagic we have: > > if (!MagicWrap (tty) || curY (tty) >= FrameRows (tty) - 1) > > emacs_abort (); > > > > Is this an assertion that needs to always hold? > > I very strongly doubt so myself. And strangely it's _always_ an > off-by-one error here just as you sketched below.
I don't think it's an off-by-one. It's simply that Emacs draws the screen top to bottom, so the very first row that violates the assertion by exceeding FrameRows is the only one that is seen.
