263687 - {inc} Scrollbar that has nothing to scroll becomes active when focused

Status: RESOLVED WORKSFORME

(Core :: Layout, defect)

Description

[Mats Palmgren (inactive)]

Scrollbar that has nothing to scroll becomes active when focused.

STEPS TO REPRODUCE:
1. Load testcase
2. Press TAB key (to focus the red box)

ACTUAL RESULTS:
The (inactive) horizontal scrollbar of the red box shows a short slider
that indicates that there is a lot of content to scroll, it is painted as
an active scrollbar.
(A page scrollbar may also appear - this is a separate known bug)

EXPECTED RESULTS:
Scrollbar should still be inactive.

PLATFORMS AND BUILDS TESTED:
Bug occurs in Mozilla trunk 2004-10-09-07 Linux.
Bug occurs in Mozilla trunk 2004-09-10-07 Linux (which is before the change
that removed the sliders for inactive scrollbars).

ADDITIONAL INFORMATION:
The bug does not occur when there is padding on BODY.

Comment 1

[Mats Palmgren (inactive)]

Attachment: Testcase

Comment 2

[Mats Palmgren (inactive)]

Attachment: Wallpaper

This fixes the problem but it's probably not the correct fix...

The root cause seems to be that the inner view returns a narrow width in
the call in nsGfxScrollFrameInner::GetScrolledSize():
   view->GetBounds()

This propagates to 'scrolledContentSize.width' which becomes less than
'scrollAreaRect.width' which makes 'maxX' negative...

Comment 3

[Mats Palmgren (inactive)]

Attachment: Testcase #2

It's not the focusing of the DIV that causes the problem, it's when the
overflow
is created...

Comment 4

[Ronald Tilby]

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

Comment 5

[Martijn Wargers (dead)]

This is wfm now, with a build with the fix for bug 240276 built in.