198363 - scrollbar slider stays fixed when scrolling w/ scrollbar arrows in drop-down listbox

Status: RESOLVED WORKSFORME

(Core :: Layout: Form Controls, defect)

Description

[Maarten Afman]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.3) Gecko/20030312
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.3) Gecko/20030312

The slider of the scrollbar of the forms drop down listbox stays fixed when
scrolling w/ arrow buttons. 
When you move the mouse around it suddenly jumps to correct position.

Reproducible: Always

Steps to Reproduce:
1. open minimized test case HTML file
2. press mouse button 1 on the down arrow of the scrollbar
3. contents of drop down list start to slide where the slider stays fixed

Actual Results:  
slider stays fixed until you move the mouse a bit at which point it takes
correct position

Expected Results:  
slider moved with the contents while using the arrow button.

Comment 1

[Maarten Afman]

Attachment: minimized testcase

minimized testcase

Comment 2

[Patrick]

Indeed. Did you notice that the slider DOES move if you move your mouse out of
the scroll zone?

Comment 3

[Maarten Afman]

I did notice that, yes. 

This is a really strange bug, because has this bug always been or is it recently
introduced? I find it hard to believe that I am the first to notice this.

I tried the following mozilla versions:
- M14 doesn't have it
- 0.8.1 doesn't have it
- 1.0.1 doesn't have it
- 1.2beta DOES have it
- 1.3final DOES have it.

So something that landed between 1.0 and 1.2 causes this. :-)

Comment 4

[Boris Zbarsky [:bzbarsky]]

This is Windows-only.

Comment 5

[Maarten Afman]

Attachment: further minimized testcase

this testcase is further stripped to the basics. 
I had to provide a large number of options to get the scrollbar to display, but
once it displays it has the problem.

Comment 6

[Maarten Afman]

I also have it with 20030322 build. 
Shouldn't this bug be accepted? 
I improved the test case and this is reproducable (although the impact isn't
that huge of course).

Comment 7

[Andreas Kunz]

Well, for me it works with Mozilla 1.3 and a current CVS build (both on Win2k).

Comment 8

[Maarten Afman]

Not fixed with latest nightly build on Windoze XP. Will try at work tomorrow,
lets see how Win2k behaves here....

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4a) Gecko/20030326

Comment 9

[Maarten Afman]

Mozilla 1.3 final works in Win2k so this bug seems Windows XP specific. 

Can anyone with Windows XP please confirm.

Comment 10

[Patrick]

Now it's a wfm under winx xp pro sp1 and Moz 2003032611

i use the minimized testcase from comment 5. i TAB to make the box "hot". When
only using arrows to go down i get just walk through the entries w/o scroll bar
altogether ;)

Making the box drop and THEN use arrow keys, the slider nicely follows the
marked item.

when making comment 2 i was able to reproduce this, but not anymore with the
latest nightly

Comment 11

[Maarten Afman]

I still have it with 2003032708 on XP Home using the "Windows Classic" theme.

Patrick, I mean clicking with the mouse on the XUL arrow buttons!! We do
understand eachother I hope? ;-))

WFM with the keyboard as well, but the keyboard is only for l33t h4ckers while
the mouse is for the rest of us...

Comment 12

[Maarten Afman]

Hey, it's now fixed between 1.4a and 1.4b! 

I notice something has changed in the drop down list as it now is 2px wider than
before, so there has been a fix / patch that also fixed this erring scrollbar. 

Comment 13

[Patrick]

marking wfm per reporter's own comment 12. 

[Since i don't know WHAT & WHY was changed to the Mozilla code to make this work
as intendend i'm not marking it as "FIXED"]