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bug#29002: it.first_visible_x is erroneously 0 while horizontal scrollin
From: |
Eli Zaretskii |
Subject: |
bug#29002: it.first_visible_x is erroneously 0 while horizontal scrolling. |
Date: |
Sun, 05 Nov 2017 20:12:26 +0200 |
> Date: Sun, 05 Nov 2017 08:59:47 -0800
> From: Keith David Bershatsky <esq@lawlist.com>
> Cc: 29002@debbugs.gnu.org
>
> Step # 1: Download a fresh copy of the emacs-26 branch.
>
> Step # 2: Inside the function `set_window_hscroll` within window.c, add a
> message just before the function returns.
>
> AUTO_STRING (my_string_one, "window.c: set_window_hscroll");
> CALLN (Fmessage, my_string_one);
>
> Step # 3: Build the new Emacs, and launch without any user configuration.
>
> Step # 4: From the Welcome screen, type: C-r
>
> Step # 5: Slowly type the word Emacs and watch the echo area as you type
> each letter.
>
> Inasmuch as the function `set_window_hscroll` is being called each time we
> type a letter, the proposed fix to #29002 causes a thorough redisplay after
> every keystroke while using isearch. This is probably not limited to isearch
> -- it was just the first occasion where the side affect was immediately
> noticeable.
OK, I made thorough redisplay happen in fewer situations.