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I don't think Paint (at least the version this is replicating) had a crop feature.

I always used to do:

- Ctrl-A (Select All)

- Ctrl-X (Cut)

- Ctrl-E, 1, Tab, 1, Enter (Resize image to 1x1 pixel)

- Ctrl-V (Paste)

You can select a section, copy it, create a new image, and paste it.

jspaint has a special shortcut, you can hold Ctrl while making a selection