261897 - Focusing the top image link causes a scrollbar

Status: RESOLVED DUPLICATE of bug 286368

(Core :: Layout, defect)

Description

[Martijn Wargers (dead)]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8a4) Gecko/20040926 Firefox/0.9.1+
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8a4) Gecko/20040926 Firefox/0.9.1+

When you focus the top link (which is the large image at the top), you get a
horizontal scrollbar to appear.
I suspect this is happening after bug 151375 was fixed.

It looks like the scrollbar is created for the outline that is painted at the
right of that image link.
I don't think this is good behavior. I would normally not expect to see suddenly
scrollbars when I focus something.

Reproducible: Always
Steps to Reproduce:
1.
2.
3.

Comment 1

[Martijn Wargers (dead)]

Attachment: Testcase

Comment 2

[Christopher Curzio]

WFM, Mozilla/5.0 (X11; U; Linux i686; rv:1.7.3) Gecko/20040914 Firefox/0.10

Have you tried a newer version of Firefox?

Comment 3

[Bill Mason]

(In reply to comment #2)
> WFM, Mozilla/5.0 (X11; U; Linux i686; rv:1.7.3) Gecko/20040914 Firefox/0.10
> 
> Have you tried a newer version of Firefox?

As the bug shows, this is a problem on the Trunk, not on the FF Aviary branch.

Comment 4

[Robert O'Callahan (:roc) (email my personal email if necessary)]

I'm not sure what, if anything, we should do about this. The scrollbars are
appearing so that you can see the outline that appears around the A element
(which has been deliberately sized as big as the viewport). We could conceivably
make scrollbars only appear when there's overflow *excluding* outlines, but that
would be a) painful to implement and b) wouldn't look good in some situations, I
think. I'll attach a testcase.

Comment 5

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Attachment: testcase that wants outline to cause scrollbars

If you size your window just right (so that making it any narrower adds a
horizontal scrollbar), then tab to the image, you'll see that we add a
scrollbar so you can scroll right to see the right outline edge.

If we didn't do that, I think this testcase would suffer.

Comment 6

[Martijn Wargers (dead)]

Attachment: Testcase

This testcase shows that also right aligned links can cause a scrollbar, when
focusing those links.

I knew this bug was/is controversial. So if this is going to be INVALID,
WONTFIX, that's fine with me. 

> If we didn't do that, I think this testcase would suffer.
Personally, I don't think the testcase would suffer. I don't care that much
about the right focus outline. If the image was at the top-left, you would not
see a top and left focus outline either (but that's probably a bug. I don't
know the bug number right now, but I think I have seen a bug about this issue)

Comment 7

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

The testcase in comment 1 would be fixed by not creating scrollbars when the
overflow is in a direction to which we can't scroll, which I think is the right
thing to do.

Comment 8

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Why can't you scroll right in testcase #1?

Comment 9

[Ronald Tilby]

Mozilla Windows Trunk Nightly Build Regression Window
Pass: 2004071609
Fail: 2004071808

Comment 10

[Martijn Wargers (dead)]

*** Bug 274982 has been marked as a duplicate of this bug. ***

Comment 11

[Martijn Wargers (dead)]

Another page that is affected by this:
http://www.bbc.co.uk/radio/aod/mainframe.shtml?http://www.bbc.co.uk/radio/aod/index.shtml?button
I can't click on the "View Compact Size" link at the right bottom of the page, a
horizontal scrollbar gets in the way.

Comment 12

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Note that this is basically the same as bug 286368.

I'd like to do something about this but I don't know what to do.

Comment 13

[Martijn Wargers (dead)]

Fwiw, this makes it impossible to click on the "Photo Gallery>>>" link on this page:
http://news.xinhuanet.com/english/2007-09/19/content_6753266.htm

Comment 14

[j.j.]

Mozilla/5.0 (Windows NT 5.1; rv:2.0b8pre) Gecko/20101019 Firefox/4.0b8pre

fixed with bug 542595