[Bug 125734] Re: Firefox scrollbar doesn't use the "infinite size" usability effect

[AleksanderAdamowski]

I did a short clean room test.

On the same physical machine, I've launched Ubuntu 8.04 desktop i386
live CD and then Kubuntu 8.04 desktop i386 live CD.

On Kubuntu, after launching, I've installed Firefox using Adept since it
isn't present by default.

The result is that Firefox in ordinary, Gnome-based Ubuntu doesn't have
this problem and I can grab and more the vertical scrollbar's thumb
after I move the mouse pointer to the extreme right side of the screen.

In Kubuntu, Firefox _has_ the problem - when I move mouse pointer to the
right side, I cannot grab the scrollbar's thumb and I have to move the
pointer at least one pixel to the left.

Assuming that this is the same Firefox binary (versions from both
Kubuntu and Ubuntu live CDs  show "Gecko/2008041514 Firefox/3.0b5"), it
would indicate that Kubuntu's default theme is to blame.

But when I install and launch KSpread using Adept in Kubuntu orusing
Synaptic in ordinary Ubuntu, it doesn't exhibit this problem at all! I
can grab KSpread's vertical scrollbar's thumb at the edge of the screen
without problems.

So maybe the problem is due to the Kubuntu's QT-GTK theme integration?


To summarize:

The same application (Firefox):
 * has the problem on Kubuntu
 * doesn't have the problem on Ubuntu

The same application (KSpread):
 * doesn't have the problem on Kubuntu
 * doesn't have the problem on Ubuntu

The only meaningful pattern I can see here is that Firefox, being a GTK
app, on Kubuntu is under influence of QT-GTK theme integration mechanism
which may be causing the problem.

Oh, BTW, all the other apps I've mentioned (Konqueror, Kedit, Gedit,
Gnumeric, Abiword etc) seem to add the border around the document area
and its scrollbars by themselves, regardless of desktop themes. So this
is a widespread, but separate problem with many other desktop apps.

-- 
Firefox scrollbar doesn't use the "infinite size" usability effect
https://bugs.launchpad.net/bugs/125734
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