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bug#26347: patch for mwheel.el
From: |
Tak Kunihiro |
Subject: |
bug#26347: patch for mwheel.el |
Date: |
Tue, 4 Apr 2017 09:55:01 +0900 |
>> During not only horizontal scroll but also vertical scroll,
>> `auto-hscroll-mode' should be disabled by following three aspects.
>>
>> (1) It should be off during horizontal scroll. If it is on, scope
>> jumps randomly when point is at the edge. Also, since
>> horizontal scroll does not move point, there will be
>> inconsistency between point and scope, and the inconsistency
>> will result in unexpected shift of the scope.
>>
>> (2) It should be off during vertical scroll. When a buffer is with
>> short and long alternative lines, scope jumps from the end of
>> long line to the end of short line. Sudden shift of the scope
>> makes edition of a wide document hard.
>
> We don't turn off auto-hscroll-mode when scrolling with the horizontal
> or vertical scroll bars, and we don't have the problems you describe
> in those cases. Why is this case different?
I see your point in regard to (1). Yes, if `mwheel-scroll’ can scroll right
or left like horizontal-scroll-bar does, turing off auto-hscroll-mode is not
necessary for case (1). Give me time to understand code of
horizontal-scroll-bar.
In regard to (2), let’s say you have a very long line and your point is at the
end
of line in a window. The next line is short and even the end of line is not
shown
in the window. The third line is very long again.
> date & session & stone & remark & date & session & stone & remark\\
> \hline
> April 4, 2017 & a & b & c & April 4, 2017 & a & b & c\\
When you move vertical-scroll-bar down, eventually the long line disappears
above the top of window. The point moves to the end of the next short line.
As a consequence, you see scope shifted. The patch tries to keep the scope to
be the same. To do so, auto-hscroll-mode was set to off.
- bug#26347: patch for mwheel.el, Tak Kunihiro, 2017/04/03
- bug#26347: patch for mwheel.el, Eli Zaretskii, 2017/04/03
- bug#26347: patch for mwheel.el,
Tak Kunihiro <=
- bug#26347: patch for mwheel.el, Tak Kunihiro, 2017/04/03
- bug#26347: patch for mwheel.el, martin rudalics, 2017/04/04
- bug#26347: patch for mwheel.el, Tak Kunihiro, 2017/04/04
- bug#26347: patch for mwheel.el, Eli Zaretskii, 2017/04/04
- bug#26347: patch for mwheel.el, Tak Kunihiro, 2017/04/04
- bug#26347: patch for mwheel.el, Eli Zaretskii, 2017/04/04
- bug#26347: patch for mwheel.el, Tak Kunihiro, 2017/04/04
- bug#26347: patch for mwheel.el, Eli Zaretskii, 2017/04/11
- bug#26347: patch for mwheel.el, Tak Kunihiro, 2017/04/11
- bug#26347: patch for mwheel.el, Eli Zaretskii, 2017/04/12