[Webkit-unassigned] [Bug 273313] New: Empty ImageBitmap created after moving GL canvas to another window

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=273313

            Bug ID: 273313
           Summary: Empty ImageBitmap created after moving GL canvas to
                    another window
           Product: WebKit
           Version: Safari 17
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: abucur at adobe.com
                CC: dino at apple.com

Created attachment 471162

  --> https://bugs.webkit.org/attachment.cgi?id=471162&action=review

Press the button to repro the issue

After moving a GL canvas to a different window, ImageBitmaps created from that canvas will be "empty". There is no exception thrown or error reported.

Expected: The ImageBitmaps created with createImageBitmap(canvas) should contain a copy of the canvas.
Actual: The ImageBitmaps created with createImageBitmap(canvas) are empty. However, when the inspector is opened on the main window with the "Graphics" tab opened, it works just fine.

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