[Webkit-unassigned] [Bug 173612] New: [macOS] Redraw error on Safari 10.1.1 and Safari Technology Preview 33

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173612

            Bug ID: 173612
           Summary: [macOS] Redraw error on Safari 10.1.1 and Safari
                    Technology Preview 33
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: Other
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: juichun_chien at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 313419

  --> https://bugs.webkit.org/attachment.cgi?id=313419&action=review

test case

Version: 
  Safari 10.1.1 (12603.2.4)
  Safari Technology Preview, Release 33 (Safari 11.0, WebKit 12604.1.25.0.2)

Hardware: 
  MacBook Pro (Retina, 15-inch, Early 2013)

OS: 
  macOS 10.12.5

Redraw error when a list/combobox is updated. 
Bug produces in Safari 10.1.1 as well as Safari Technology Preview 33 (Safari 11.0, WebKit 12604.1.25.0.2)

1. Open the attached test case.
2. Tab to/click on the text field to bring it into focus. A listbox will be displayed beneath the text field.
3. Type 'ca' (or any other characters) into the text field to filter the results. Only 3 relevant results should remain in the dropdown list.

Notice that below the shortened dropdown list, there is a residual of box-shadow from the original list.

This will only be resolved when Safari window goes out of focus (switching to other applications, then back to Safari).

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