We get the value from the root window and we parse it using regex.
Also use this in 'move', 'resize' and 'grid' plugins by default, doing the
appropriate lightening / darkening to make this working properly
on the desktop surface

Approved by: Andrea Azzarone

resize: add support for disabling transparency and avoid over-damaging in outline mode (LP: #1700859)

Approved by: Andrea Azzarone

The fade-out animation was still happening when the duration was set to 1,
while it was broken when it was 0. Fixed both.

In unity-lowgfx.ini set the animation duration to 0 in grid and d not
draw stretched windows. Enable blending again as it's really not
expensive in this case, while not having it, really makes the user
experience a lot poorer. (LP: #1700859)

Approved by: Andrea Azzarone

Also we don't really need to damage at every X event. It's just about doing it
right the firs time, by including the exceeding space.
Also optimize damanging in outline-mode, by only touching such regions

Plus add some optimizations when not blending, as we don't care about the alpha channel (LP: #1700859)

Approved by: Andrea Azzarone

Don't miss the values... regex_match returns true if valid

If the average color for the desktop is defined, let's use it
for painting the alternative view of move window.
Added also an option (on by default) to draw a larger border
using a lighter or darker color (depending on the current color
average), to make all this more visible.

If the average color for the desktop is defined, let's use it
for painting the alternative view of move window.
Added also an option (on by default) to draw a larger border
using a lighter or darker color (depending on the current color
average), to make all this more visible.

We get the value from the root window and we parse it using regex.

Matched values are returned as a list of strings.

Enable blending again as it's really not expensive in this case, while not having
it, really reduces the user experience a lot.

This avoids to repaint everything in the screen

And move the variables in the private section

Also we don't really need to damage at every X event. It's just about doing it
rigth the firs time, by including the exceeding space

Approved by: Marco Trevisan (Treviño), ksamak