fix: canvas data in iframe wasn't applied in the fast-forward mode #944
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In #853, I implemented the virtual dom for the fast-forward mode. But there is a corner case I didn't deal with.
If a canvas element is created with image data (serialized to
rr_dataURL
) in an iframe, it will be rebuilt as an empty canvas without the initial image data, in the fast-forward mode (using Virtual Dom optimization).A simple test case is also added in this PR to reproduce this corner case.