Reorganize the code to break up positioning into:
1) updating workspace object's scale and position
2) applying the updated parameters to the workspace actor
3) scrolling the view to a particular workspace
4) handling dragging of the scroll bar
With these cleanups, it becomes much easier to fix
the following issues:
- use animations consistantly instead of doing hard breaks
for some actions and smooth transitions for others
- snap to the closest workspace when scrolling stops
(https://bugzilla.gnome.org/show_bug.cgi?id=607823)
- fix the regression of the zoomFromOverlay animation when
the selected app is on another workspace
(https://bugzilla.gnome.org/show_bug.cgi?id=609081)
https://bugzilla.gnome.org/show_bug.cgi?id=609673
8ef75524ea