fix dataurl and improve docs for move forward/backward #4229
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close #4217
close #4213
close #4201
The dataurl issue was from the cancelling of renderall request.
The request was cancelled, but the flag was not set to empty.
At that point the next request after the dataurl was not quequed because the flag was indicating that one was already in progress.ix
Fix free drawing. Created path are created top left positioned and then translated where needed