[Webkit-unassigned] [Bug 280757] New: [iOS] requestFullscreen causes window.screen.orientation.onchange events on non-Safari WKWebView

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=280757

            Bug ID: 280757
           Summary: [iOS] requestFullscreen causes
                    window.screen.orientation.onchange events on
                    non-Safari WKWebView
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ajuma at chromium.org
                CC: bfulgham at webkit.org, jer.noble at apple.com,
                    simon.fraser at apple.com, wenson_hsieh at apple.com,
                    zalan at apple.com

Created attachment 472767

  --> https://bugs.webkit.org/attachment.cgi?id=472767&action=review

Test page

In a WKWebView (that has WKPreferences.elementFullscreenEnabled = YES), calling requestFullscreen can trigger spurious and incorrect window.screen.orientation.onchange events.

Steps to reproduce (in plain-WKWebView or Chrome on iOS, but not in Safari):
1. Rotate iPad to landscape
2. Call requestFullscreen on some element

Expected result:
no orientation change events

Actual result:
We get a sequence of orientation change events: portrait-primary landscape-secondary portrait-primary landscape-secondary

I've also attached a test page (from crbug.com/370696600) that demonstrates the bug. Make sure to start in landscape. The bug doesn't repro in portrait.

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