fix wait for vsync command #272
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ensures that `canvas->noOp()` is called before `canvas->waitCompletion(true)` when the “wait for vsync” command is processed. when the drawing queue is empty `waitCompletion` always returns immediately, so this ensures that a no-op is present in the queue waiting to be processed.
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ensures that
canvas->noOp()is called beforecanvas->waitCompletion(true)when the “wait for vsync” command is processed. when the drawing queue is emptywaitCompletionalways returns immediately, so this ensures that a no-op is present in the queue waiting to be processed.fixes #271