Allow changing rectangle sizes, position and re-create rectangle before collecting region bounds

[Gigas002]

Don't know much about waysip's inner implementation and wayland protocol stuff, so I can't provide a decent implementation, at least in a near future. Sorry.
Didn't dive deep into implementation, but I think watershot can be used as reference for this, since it has this functionality implemented. From higher level perspective, it looks like it's matching for application state (based on user input), while being in an endless loop, when the user does some nasty stuff with rectangle
As for user usage perspective, I think the feature can be hidden under a new flag, -A for example (as it was proposed in a similar PR for slurp)
Also, would be neat if we could also set the keybindings for this somehow (through args or config maybe?). watershot does this by matching on a Keysyms, so a similar approach can be used, I guess.

[Shinyzenith]

This feature sounds good to me and I'll try to impl it when I get the time.

[Shinyzenith]

Apologies....wrong thread