Screenshot follow up
This adds the missing screen flash when the screenshot fires by making the PhoshFader
class more flexible.
It also adds copy-to-clipboard on <ctrl>-<printscrn>
. For that we use a transparent layer-surface. There's a twist there in that i didn't find a good point in time when copying to clipboard is possible so we use a fixed 1s timeout which isn't nice. But given that we use gnome-screenshot
anyway on mobile which uses files not clipboard for exchange it likely not that bad.
Signed-off-by: Guido Günther guido.gunther@puri.sm