When we move the selection around, we see the coordinates of the cursor (both on the ruler and on the status bar), which don't help a lot because we might have grabbed it from anywhere.

The suggestion is to add the top-left position, alongside the size; something like the illustrative red part added over a status bar screenshot.

This helps with pixel-level moves (and nicely complements #13 - display size of selection area in pixels); alongside #53 - use arrows for accurate selection would make Pinta the go-to tool for pixel-level editing! ❤️

Thank you!