I added a pixel readout to omasnap

On macOS I used Cmd+Shift+4 to measure things. Drag the crosshair over anything and it tells you how many pixels wide it is. Half the time I never took the screenshot, I just read the number and hit Esc.

omasnap does everything else I want from a screenshot tool, but it never told me how big my selection was. So I added it.

An idle crosshair shows the pointer position, dragging shows the size. Same when you hover a window or pull a crop handle.

It reports native pixels, not logical ones. My monitor runs at scale 2, so a 600 by 400 drag is 1200 by 800 in the file. The logical number would not match anything you can point at.

The PR is here.