> I guess this is done to be consistent with the defaults of the
> respective window-system.
If that's the rationale, I suggest moving scroll bars to the right on
GTK as well.
The main reason for putting scroll bars on the left is that most of the text
is on the left. In ordinary X11 toolkit scroll bars, there are mouse
clicks whose operation is based on the line you click on, so it is useful
to see the scroll bar close to the text on the line.
However, the scroll bar commands on Windows and the Mac don't work
that way, and it is not particularly useful for those scroll bars to
be on the left. So they may as well go on the right, where people
usually expect them.
I am not sure what the scroll bar commands in the GTK version do.
If they work like those of Windows, then those scroll bars may as
well be on the right.