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bug#4023: mwheel.el uses (point) instead of point-before-scroll
From: |
Chong Yidong |
Subject: |
bug#4023: mwheel.el uses (point) instead of point-before-scroll |
Date: |
Fri, 04 Dec 2009 21:46:36 -0500 |
> Just upgraded emacs to 23.1 and noted the following issue, related
> (apparently) to mwheel.el.
>
> Here is how to (hopefully) reproduce the problem.
>
> In an emacs window (under X):
>
> => set the point with mouse-1
> => select a region with mouse-3 some lines below
> => now scroll down with the mouse wheel so that the bottom of the
> selected region scrolls `out' of the upper edge of the emacs window
> (the highlighted region must disappear)
> => extend the region by mouse-3 again
> => paste the region with mouse-2 somewhere (e.g. in a clean buffer)
>
> Result:
> only the text between the *visible* top of the window and the end of
> the region has been pasted. I.e. all works as if the beginning of
> the selected region had moved the first line of the visible portion
> of the buffer.
>
> This contrasts with the behavior in emacs-22.3, where extending the
> region while scrolling down with the wheel used to work as expected
> (by me): the contents of the region started from the point set with
> mouse-1 at the beginning.
>
> The (correct) behavior in 23.1 is obtained if scrolling is performed
> with the side bar, instead of the wheel (and also if the scroll with
> the wheel does not make the bottom of the region fly out of the upper
> window edge)
This change was made in response to a complaint by Glenn Morris, about
the behavior you desire:
http://lists.gnu.org/archive/html/emacs-devel/2008-04/msg00409.html
Double-click with left mouse to select the word "tree" from "This
directory tree...". The word "tree" is highlighted with region face.
Scroll down with mouse-wheel so that "tree" goes off the top of the
screen.
Scroll back up with mouse-wheel.
Now the region has been extended to cover a lot more text. The further
I scroll down initially, the more is highlighted.
I have no preference for either behavior, because I don't use the mouse
wheel much. Either way, we should probably make the scrollbar and mouse
wheel behavior consistent, though.
Glenn, what do you think?
- bug#4023: mwheel.el uses (point) instead of point-before-scroll,
Chong Yidong <=