Re: Bug in incremental undrawing of mouseover highlighting

[storm@cua.dk (Kim F. Storm)]

Richard Stallman <rms@gnu.org> writes:

> Thanks for confirming that this is fixed.

Actually, it is NOT fixed.

Following the original recipe, it is easy to see the bug:

> I experience this bug fairly often in relatively mild form which is
> annoying but not unbearable.  But I've just run across a severe case
> of presumably the same bug.  It occurred while reading
> gnu-emacs-source from Gmane with Gnus.  The article that shows the
> problem is at <http://permalink.gmane.org/gmane.emacs.sources/1977>,
> and here's how to reproduce it:
>  
> 1. emacs -Q
> 2. M-: (setq gnus-select-method '(nntp "news.gmane.org")) RET
> 3. M-x gnus RET
> 4. S s gmane.emacs.sources
> 5. RET
> 6. C-s M-e [ 187: Alf-Ivar Holm RET C-f RET, i.e., go to this article
> and open it.
> 7. In the *Article* buffer, click on the MIME part header
> [2. Displaying ISO week in calendar, updated for emacs 22, 2nd try ---
> application/emacs-lisp; calendar-hack.el].  You'll see that the entire
> text of the attachment has mouse-face highlighting, and if you scroll
> over this part the incremental undrawing bug is apparent en masse.
> Now click the MIME part header again to close it, and either the
> entire header or the second line of will be double.  Further clicking
> to open and close the MIME part increases the number of (parts of)
> headers displayed.


I see all of the reported problems!

I pressed SPC to see the MIME part header, then clicked on it, and
moved the mouse over the expanded attachment text to highlight it,
I then pressed SPC a couple of times to scroll the buffer, and pressed DEL
to get back to the MIME header - and clicked it .. and the last line
is shown three times.

And there are lots of mouse-highlight artifacts.

This is probably a problem with scrolling through multiline
mouse-hightlight which spans multiple pages.

Chong, could you take another look at it?

-- 
Kim F. Storm <storm@cua.dk> http://www.cua.dk