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bug#16475: enhancement request: remove vertical scroll bar automatically
From: |
Eli Zaretskii |
Subject: |
bug#16475: enhancement request: remove vertical scroll bar automatically when not needed |
Date: |
Thu, 26 Oct 2017 18:59:02 +0300 |
> Date: Thu, 26 Oct 2017 09:56:59 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: esq@lawlist.com, 16475@debbugs.gnu.org
>
> > More importantly, removing the scroll bar resizes the external
> > dimensions of the frame, to keep the windows' dimensions unchanged
> > (otherwise, we couldn't remove the scroll bars at the very end of the
> > window's redisplay). You can see this in action if you toggle
> > scroll-bar-mode on and off. So when the window shows _almost_ all the
> > text of the buffer, the frame would annoyingly oscillate in its
> > horizontal dimension. This could be caused, for example, by echo-area
> > messages that resize the mini-window from time to time, or by the user
> > adjusting the window size.
>
> Obviously, an equivalent of ‘set-window-scroll-bars’ would have to be
> used here.
I agree, but then the right place to call this is not from redisplay,
but from keyboard.c, before it calls read_char (which calls
redisplay). set-window-scroll-bars triggers a redisplay cycle, so
calling it from (the end of) redisplay is not very wise, IMO.