Fix onScrollbarPresenceChange not invoking at correct timing #1712
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Hi
![before](https://user-images.githubusercontent.com/18242049/145956875-bbc17831-f8ac-466d-9b22-be25dbe07eb9.gif)
![after](https://user-images.githubusercontent.com/18242049/145957336-91ea1c2e-769d-478f-b398-0f1f9e0fd084.gif)
I noticed that the calculation of
verticalScrollBarSize
does not consider the current horizontalScrollBarSize, and vice versa, which lead to incorrect invoke timing of onScrollbarPresenceChange, as shown belowafter adding
this._horizontalScrollBarSize
andthis._verticalScrollBarSize
, it work normal