bug#20356: 25.0.50; Strange terminal glyphs in emacs -nw in recent master

[Eli Zaretskii]

> From: Jorgen Schaefer <contact@jorgenschaefer.de>
> Date: Fri, 17 Apr 2015 11:33:32 +0200
> 
> Since a few days (I recompiled Emacs the first time on Wed 15th or Thu
> 16th, not sure when this was introduced before that) I see terminal
> glyph garbage on certain deletion operations in emacs -nw.
> 
> A reliable way to trigger this for me is M-DEL, though many deletion
> operations cause spurious data to be displayed. C-l will remove said
> glyphs, and neither scrolling, normal editing nor indeed
> single-character deletion will trigger this bug.
> 
> This is in a Gnome Terminal with TERM=xterm, sshing to a server, and
> Emacs started in a screen with TERM=screen.
> 
> The Emacs built from ref 0465c9dd (last Apr 7th commit) does not exhibit
> this behavior.
> 
> I know from at least one other person that recent builds with emacs -nw
> work fine for them, so this is likely going to be tricky to debug. I'm
> happy to do any testing needed.

Can you "git bisect" to find the offending commit, please?

TIA