Prevent error on Touch.disable(stage) #1042
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If the browser doesn't support touch events, then calling Touch.disable causes an error. The error is because stage.__touch is never initiated in Touch.enable and so trying to delete it causes an error. This is fixed by adding a check for stage.__touch in Touch.disable.
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If the browser doesn't support touch events, then calling Touch.disable causes an error. The error is because stage.__touch is never initiated in Touch.enable and so trying to delete it causes an error. This is fixed by adding a check for stage.__touch in Touch.disable.