Not initializing lastX and lastY leads to NaN #357
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After lines 238 and 239 computation, if lastX and lastY are not initialized (undefined), updates.rotateDeltaY and updates.rotateDeltaX equal NaN.
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After lines 238 and 239 computation, if lastX and lastY are not initialized (undefined), updates.rotateDeltaY and updates.rotateDeltaX equal NaN.
Example :
