Is your feature request related to a problem? Please describe.

I have the Allow resizing rect area selection by default option selected, because I find it easier to get the exact rectangle size I want this way. However, once I have the right rectangle, I have to switch my right hand from mouse to keyboard in order to press Enter to confirm the selection.

Describe the solution you'd like

It would be great if:

• double-clicking within the rectangle (or actually anywhere on the screen) would be an alternative way to confirm the selection.
• Control-C also confirmed the selection and copied it to the clipboard

Additional context

• Flameshot supports Control-C for confirming the selection.
• Other image manipulation tools (e.g. gimp, IIRC) interpret a double-click within a crop rectangle to mean confirmation of that rectangle.