122181 - Scrollbar thumb is not invalidated when it goes out of :hover

Status: RESOLVED WORKSFORME

(SeaMonkey :: Themes, defect)

Description

[Brian Ryner (not reading)]

As hyatt and I discussed, the scrollbar thumb can get "stuck" in a hover state
when you move the pointer from the thumb into the page content area.  It does
not seem to happen when you move the pointer from the thumb into the scrollbar
track, which suggests the problem happens when the pointer crosses a widget
boundary.  The problem is visible on winxp and on Linux if you use the classic
theme with nsITheme support enabled.

Comment 1

[Brian Ryner (not reading)]

Chris, any ideas on this one?  This should be happening via
nsEventStateManager::SetContentState(), right?

Comment 2

[Brian Ryner (not reading)]

Ok, I tracked this down.  The problem is that the repaint is being "optimized"
to a repaint on the parent content (the scrollbar track) when the pointer is
moved from the thumb onto the track.  Both Linux and Windows'
WidgetStateChanged() method on the NativeTheme class is returning false for
aShouldRepaint for the scrollbar track, so no repaint is happening.

Reassigning to hyatt to fix the win32 WidgetStateChanged() method.

Comment 3

[Kai Liu]

Cannot reproduce this old bug.