20476 - Clicks close to scrollbar thumb causes scroll-to-beginning/end

Status: VERIFIED DUPLICATE of bug 22512

(Core :: DOM: UI Events & Focus Handling, defect, P3)

Description

[saschmit]

Go to a page where the thumb ends up small in comparison to the height of the
window (say 1/5).

Click just below the thumb (within approximately 1 thumb-height) the page will
scroll all the way (or significantly so) to the bottom step by step. This is
somewhat erratic--sometimes it makes it only half way, others some other
portion, and others it will only go down one step (rather rare). Usually,
however, it makes it all the way.

Try the same just above the thumb. Same behavior but in the opposite direction.

Click more than one thumb-height above or below the thumb...it pages up/down one
step as appropriate.

I will attach a simplified test case which does a perfect job of illustrating
the problem.

Comment 1

[saschmit]

Attachment: Simplified test case for this bug (1000 line breaks)

Comment 2

[cpratt]

Changing platform and OS to All. This bug also exists (for example) in the
1999120208 build under Mac OS 8.5. As far as I can tell, if you click in the
area of the scrollbar not currently occupied by the thumb, but which will be
occupied by the thumb after clicking once, the click seems to be interpreted as
a double-click. If you click in an area of the scrollbar not currently occupied
by the thumb, and which will not be occupied by the thumb after the page is
scrolled, it behaves as expected (correctly) in that only one click seems to
happen. Very interesting.

Comment 3

[joki (gone)]

Hey Dave, you said this is your fun not mine, right?

Comment 4

[Colin Blake]

I'm seeing it in the OpenVMS build too. Interested to see what it turns out to

be - adding myself to the cc list.

Comment 5

[Peter Trudelle]

*** Bug 22339 has been marked as a duplicate of this bug. ***

Comment 6

[Sean Richardson]

*** Bug 22429 has been marked as a duplicate of this bug. ***

Comment 7

[Sean Richardson]

*** Bug 20672 has been marked as a duplicate of this bug. ***

Comment 8

[Sean Richardson]

*** Bug 22616 has been marked as a duplicate of this bug. ***

Comment 9

[Sean Richardson]

In bug 21243, [e-mail] said he'd steal any and all gfx-scrollbar
bugs. Changing QA Contact to "[e-mail]" from "[e-mail]"

Comment 10

[Sean Richardson]

*** Bug 23340 has been marked as a duplicate of this bug. ***

Comment 11

[Eric Vaughan]

*** This bug has been marked as a duplicate of 22512 ***

Comment 12

[Claudius Gayle]

VERIFIED Dupe.