Re: Scrollbars ?

[Stephan Hennig]

Richard Stallman schrieb:

>     When dragging the handle and moving it down (or up, but without changing
>     direction during the operation) the contents of the window does not
>     always move up. While dragging the handle the contents sometimes moves
>     down again and then up again.
> 
> I don't entirely understand, but that does sound fishy.
> Can you provide a precise test case?
> 
> Try using etc/PROBLEMS in your test case.  That's something we have,
> and it isn't likely to change just now.

I'll try to prepare one. Thanks for your assistance.


>     >     (iii) Then clicking on the scrollbar causes the bar to shift up 
> every
>     >     time you click.
>     > 
>     > What button did you use, and where?
> 
>     I clicked the scrollbar handle on the right of Emacs' frame.
> 
> What button did you click?  And where?

Sorry, I do not seem to get your question. But I made some screen shots
to illustrate my original bug report.


> Symptoms:
> (i) While dragging the scrollbar and scrolling down slowly the window
> content wobbles vertically. This can be best seen when reaching the end
> of the file.

Hard to visualize since it occurs while dragging the handle, but I'll
come back to that later.


> (iv) This bug seems to interfere with AUCTeX. Dragging the scrollbar to
> the end of a window does not move to the end of a file but one or two
> lines above the last line. You have to click on the down botton below
> the scrollbar to visit the last line (or use the keyboard). This
> item (iv) seem only to appear with tex files (AUCTeX is installed on
> my Emacs), but not with other files.


The same problem occurs with java source files[1], so it's not related
to AUCTeX. Link [2] shows Emacs after loading a .java file. As a side
note, you can see the problem with the symbol panel explained in mail
"startup frame position".

The next screen shot was taken after dragging the scrollbar handle down
to the end and releasing it.[3] As you can see in the status bar there
are some remaining lines that are not displayed.

I can see those remaining lines after clicking on the button below the
scrollbar handle (five times).[4]


> (iii) Then clicking on the scrollbar causes the bar to shift up every
> time you click.

Now /clicking/ on the scrollbar handle moves the scrollbar handle up
(and window content down) as if I dragged the handle.[5]

Thanks for your patience!

Regards
Stephan Hennig


[1] <URL:http://home.arcor.de/stephanhennig/Downloads/Ahuja.java>
[2] <URL:http://home.arcor.de/stephanhennig/Downloads/scrollbar-1.png>
[3] <URL:http://home.arcor.de/stephanhennig/Downloads/scrollbar-2.png>
[4] <URL:http://home.arcor.de/stephanhennig/Downloads/scrollbar-3.png>
[5] <URL:http://home.arcor.de/stephanhennig/Downloads/scrollbar-4.png>