Fix flicks after a full reload or when close tab button (dis)appear. (Fix #1490, #1575, #1579) #1602
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This PR fixes #1490.
Adding
-webkit-backface-visibility: hidden
does the trick. I didn't notice any perf issue after adding it.Adding it to main body or iframe body does the trick too. But I think it is better to colocate the trick with the incriminated transition.