[Webkit-unassigned] [Bug 250501] New: [UI-side compositing] alert() causes entire page contents to disappear

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250501

            Bug ID: 250501
           Summary: [UI-side compositing] alert() causes entire page
                    contents to disappear
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Process Model
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Created attachment 464466

  --> https://bugs.webkit.org/attachment.cgi?id=464466&action=review

Simple test

Summary:
If a page triggers a JavaScript dialog (alert, confirm etc), then the entire page contents go missing.

Steps To Reproduce:
1. Start a GitHub review (I was on https://github.com/WebKit/WebKit/pull/8277/files)
2. Add a pending comment
3. Try to remove the comment

Results:
When the alert shows up, the page contents disappear and don’t come back until you do a cross-origin navigation.

Regression:
Regression with UI-side compositing.

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