Display blurry when elements with position attributes and have scrollbars.

[renzhaoz]

Summary:

Steps to reproduce:

1.Open a dialog； 2.Create a content such as a div,set css style like this: position:fixed; overflow:auto; height:30px; 3.Add child element in this div box when scrollbar show!

Expected behavior:

Link to example of issue:

Additional notes:

version: 3.16.1

[renzhaoz]

If dialog have scrollbar all dialog content display blurry!

[diasbruno]

@renzhaoz Do you see this on all browsers?

[renzhaoz]

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