swaygrab: support region selection

[2Belette]

swaygrab is working nicely but it would be nice to be able to select a window or a region with the mouse instead of taking the full screen for producing the screenshot (like maim/slop)

[cauebs]

Adding a parameter for the coordinates is already enough, then we can leave the rest of the work for slop.

[ranisalt]

I will try 😄

[ddevault]

swaygrab is deprecated, through the combination of grim and slurp on sway 1.0 you can achive this functionality.

[manio]

@SirCmpwn
If it's removed from the git and deprecated then maybe can you please update the wiki?
https://github.com/swaywm/sway/wiki#taking-screenshots

Thanks in advance! :)

[RyanDwyer]

The wiki shouldn't be updated until 1.0 is released. The content is still relevant for sway 0.15 which is the latest release.