[Webkit-unassigned] [Bug 218213] New: REGRESSION: MobileMiniBrowser frequently fails to repaint

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218213

            Bug ID: 218213
           Summary: REGRESSION: MobileMiniBrowser frequently fails to
                    repaint
           Product: WebKit
           Version: WebKit Local Build
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kbr at google.com
                CC: bfulgham at webkit.org, dino at apple.com,
                    jdarpinian at chromium.org, jer.noble at apple.com,
                    kkinnunen at apple.com, simon.fraser at apple.com,
                    zalan at apple.com

After syncing my WebKit iOS Simulator Debug build to top-of-tree (it had previously been ~1 month out of date), loading pages in WK1 mode in the MobileMiniBrowser frequently results in the browser failing to repaint.

Clicking the "reload" button makes the page render correctly.

Scrolling doesn't fix the problem; the last page's content (blank, upon the initial launch and load of https://webkit.org/ ) is scrolled.

Control-clicking to try to select text usually provokes a repaint.

This mode (WK1 in the iOS simulator) is the easiest mode for contributors to test. Is there any chance of help tracking down the cause of this regression?

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