154470 - drag-scrolling thumb causes permanent hold when done rapidly

Status: RESOLVED DUPLICATE of bug 128328

(Core :: XUL, defect)

Description

[Thomas F. O'Connell]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-US; rv:1.0.0) Gecko/20020529
BuildID:    2002052918

basically, on any window with a scrollbar, if the thumb in the scrollbar is
dragged rapidly in a single direction and then the mouse is released, the thumb
will continue to follow the mouse.

Reproducible: Always
Steps to Reproduce:
1. launch Mozilla
2. visit http://www.mozilla.org/quality/help/bugzilla-helper.html
3. position the scrollbar at the top
4. click the thumb and drag down rapidly.
5. before the scrollbar reaches the bottom of the page, release the mouse.
6. keeping the cursor relatively near the thumb, continue to move the cursor.

Actual Results:  the thumb continues to follow the mouse cursor.

Expected Results:  the thumb should have ceased moving where the click was released.

i'm guessing this is only a problem with Mac OS X, which seems to have the
majority of the timing issues i've noticed thus far, and this seems to be a
timing issue, as it doesn't happen if the scenario above is performed in
anything other than a rapid manner.

also, if the cursor moves far enough away from the scrollbar pane while the
thumb is still held, the thumb will snap to a single position that depends on
which side of the scrollbar the cursor is on. if the cursor returns to near the
scrollbar, the thumb will then begin following the cursor again.

this seems to be the best component for this bug, as it seems to affect Browser
and MailNews.

Comment 1

[Frankie]

*** This bug has been marked as a duplicate of 128328 ***