[Webkit-unassigned] [Bug 124410] New: [CSS Regions] Deselection not working properly when using regions with certain writing modes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=124410

           Summary: [CSS Regions] Deselection not working properly when
                    using regions with certain writing modes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: AdobeTracked
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: stavila at adobe.com
            Blocks: 57312


Created an attachment (id=217048)
 --> (https://bugs.webkit.org/attachment.cgi?id=217048&action=review)
Test case

Reproduction:
- select text in region (including overflow)
- click somewhere else to clear selection.

Expected result: 
- selection should clear

Actual result:
- paint artefacts from the selection remain

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