Keyboard.find_key/find_keys: Match any region that contains the selection
Keyboard.find_key/find_keys: Match any region that contains the selection

The region we detect from image-processing is unlikely to match the
model's regions (usually specified using stbt.Grid) exactly. This allows
us to be fairly sloppy with our grid coordinates, while still detecting
the selected key accurately.

stb-tester/stb-tester,stb-tester/stb-tester,stb-tester/stb-tester,stb-tester/stb-tester