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bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window wid

From: Anders Lindgren
Subject: bug#22891: 25.0.92; set-fringe-mode with left fringe 0 breaks window width calculations on Mac OS (again)
Date: Thu, 14 Apr 2016 07:33:15 +0200


I took a look at this from the NS port point of view.

Setting the `left-frame' frame parameter to any from 1 and up change the width of the fringe, while retaining the width of the text area (80 characters). However, setting it to 0 makes the text area wrap on 79 characters (despite there being space for the 80:th character) while `window-width' still returns 80.

Presumably, this is the root cause of the ansi-term problem.

However, to check if this was a NS specific problem, I tested this on a freshly built GTK+ emacs on LinuxMint. It turned out that it, too, suffers from the same problem, so I'm handing over this to you, Martin.

Steps to repeat:

   emacs -Q
   C-u 8 0 x RET
        ;; This inserts a line wide enough to reach the right side of the screen without wrapping)
   (set-frame-parameter (selected-frame) 'left-fringe 50)
        ;; This makes the left fringe wide, the text area still holds the 80 x:s nicely.
        ;; 80
   (set-frame-parameter (selected-frame) 'left-fringe 1)
        ;; Narrow left fringe. Text area still holds the x:s
        ;; 80
   (set-frame-parameter (selected-frame) 'left-fringe 0)
        ;; The line of x:s wrap
        ;; 80 -- inconsistent with what is displayed on screen.
    -- Anders

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