
numeric
The mouse button used to terminate gin (graphic operations) operations. By default it has a value 2, i.e the middle button on a 3-button mouse, or the right button on a 2-button mouse.
Gin may also be terminated by pressing the ESC keyboard character, which will also generate a value of abort_button in button (the last button pressed).
The value of abort_button can be redefined.
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 button (numeric)  |