bug#22891: Fixed: 25.0.92; set-fringe-mode with left fringe 0 breaks win
From:
Anders Lindgren
Subject:
bug#22891: Fixed: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again)
Date:
Wed, 27 Apr 2016 23:38:16 +0200
This problem has been fixed and published on "master" and backported to "emacs-25" (after being approved by Eli).
In the end it was not related to OS X. Instead, it was a function in window.el used to by terminal windows to track the window width that didn't take the continuation glyph into account. (The continuation glyph is visible when the width of a fringe is zero.)