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bug#26994: 26.0.50; display bugs with auto-hscolling current line
From: |
Eli Zaretskii |
Subject: |
bug#26994: 26.0.50; display bugs with auto-hscolling current line |
Date: |
Sat, 20 May 2017 10:37:32 +0300 |
> From: Stephen Berman <stephen.berman@gmx.net>
> Date: Fri, 19 May 2017 11:36:40 +0200
>
> 0. emacs -Q
> 1. Make a long (> 160 columns) line of text, e.g. in *scratch* join the
> two lines and duplicate them: C-p C-p M-^ C-a C-k C-y C-y
> 2. Copy this long line and yank it below (optional, just to see the
> effect of auto-hscrolling clearly): C-a C-k C-y RET C-y
> 3. M-x toggle-truncate-lines
> 4. M-x customize-option RET auto-hscroll-mode, set value to "Scroll only
> the current line" and set it for the current session.
> 5. Return to *scratch* and put point at the start: M-<. Enable
> column-number-mode to track the column of point:
> 6. Start moving point forward, e.g by repeating M-f. On moving over
> the first occurrence of "create", this line (but not the one below
> it) is scrolled, correctly. Continue repeating M-f.
> => When point reached column 160 (for me that's the space after the
> second occurrence of ";; This buffer is"), the cursor is visible, but
> the next M-f makes it disappear and the line no longer scrolling;
> however, you can see from the column number in the mode line that
> point keeps advancing.
>
> When scrolling stops depends, AFAICT, on (one or both of) the
> window-width and the font size.
>
> A second, likely related, display bug happens in combination with
> text-scale-adjust:
>
> 7. Return to BOB (M-<). Invoke increased text-scale-adjust (C-x C-+)
> and start moving forward by repeating M-f.
> => At some point (for me at column 130), while advancing point
> columnwise (C-f) the line also moves pixelwise to the left and then
> (after 3-4 pixels) jumps back. Continuing with C-f repeats this
> effect.
> With decreased text-scale-adjust (C-x C--, making sure the size is
> below the default, not just returned to it), the mirror-image effect
> happens (for me, starting at column 176 with the smaller size): the
> line moves pixelwise to the right and after several pixels jumps back
> to the left, and so on.
> When the default size is restored, the pixelwise movement stops (but
> the above hscrolling problem remains).
Thanks, should be fixed now.