With the two previous commits we can now safely remove the `restacked` signal
watching. For some reason watching the signal is this way blocks clicks while things are
moving.
So now it's possible to eg. doubleclick on the left/right edge and jump
two places.
onCompleted of the tween of the active window didn't always finish before all
other windows was done animating (seemingly at least). This caused a wrong
overlay position/width since it used `is_scaled` to find the top of the stack.
In general it's probably useful to be able to know which windows are stacked
before animations are done. Windows might be scaled for other reasons too.
Also fixes a bug where the left overlay was active even though the neighbor
fully obscured the left stack. (that caused a small region of the left most
unstacked window to unresponsive). (due to setting negative width being a noop)
We have to do this since mutter/gnome-shell does not account for stacking order
when handling mouse input. Ie. the overlay region ask to receive mouse input
from mutter. It does this even when it's below a window actor. (Only affects
X11, not wayland)
Turned out to be a bit more difficult than expected to make icons
visually pleasing. Mainly during animations. Icons are thus disabled.
Problems:
- The overlay prevents the cursor from changing shape to "resize" when
hovering the left/right side of the left/right-most non-stacked
window. It still works to resize though.
- Icon support semi-broken and ugly during transitions.
Ref: #10
