[Webkit-unassigned] [Bug 197962] New: border-image-repeat: repeat rendering is broken (on low-dpi screens only?)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197962

            Bug ID: 197962
           Summary: border-image-repeat: repeat rendering is broken (on
                    low-dpi screens only?)
           Product: WebKit
           Version: Safari 12
          Hardware: Unspecified
               URL: https://jsfiddle.net/snover/jwvzbt1x/show/
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bugs.webkit.org at zetafleet.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 370063

  --> https://bugs.webkit.org/attachment.cgi?id=370063&action=review

Screenshot showing broken rendering in Safari

1. Visit test case https://jsfiddle.net/snover/jwvzbt1x/show/

Expected: Rendering matches Firefox/Edge: consistent rendering of all borders with no gaps or solid lines
Actual: Borders are rendered badly, with large gaps and solid lines

I am not currently able to reproduce the bad rendering on a MBP retina display, only on an attached external low-dpi monitor.

Other browsers:

Firefox: OK
Edge: OK
Chrome: Broken (differently)

Safari 12.1.1 (12607.2.6.1.2)
macOS 10.12.6

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