[Webkit-unassigned] [Bug 272321] New: REGRESSION: USDZ Blobs fail to open directly to AR QuickLook on Safari iOS 17.5 beta

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=272321

            Bug ID: 272321
           Summary: REGRESSION: USDZ Blobs fail to open directly to AR
                    QuickLook on Safari iOS 17.5 beta
           Product: WebKit
           Version: Safari 17
          Hardware: iPhone / iPad
                OS: iOS 17
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mail at milesgreen.net

Created attachment 470811

  --> https://bugs.webkit.org/attachment.cgi?id=470811&action=review

When opening used blob user is asked if they wish to download file

With the new iOS 17.5 beta release (21F5048f) there is a regression in behaviour when opening a USDZ blob to AR QuickLook from Safari.

Previously, when passing a USDZ blob to AR QuickLook, the 3D model would open directly in AR.

Now, in iOS 17.5 beta, when opening a USDZ blob, the user is presented with a prompt that asks:

> Do you want to download "model.usdz"?

With options to "View" or "Download"

Selecting "Download", downloads the file (undesirable).

Selecting "View" displays the default model thumbnail image, with an AR icon at top right. The user must tap again to open the model in AR. Closing the AR view returns the user to the model thumbnail. From here the user must use the back button to get back to the originating HTML page. 

This greatly breaks the existing user experience.

Repro steps:

- Using iPhone with iOS 17.5 beta
- Visit this page: https://modelviewer.dev/examples/scenegraph/#variants (uses ModelViewer web component to generate USDZ blob)
- Tap the AR icon bottom right of the model
- Observe that a prompt asks if you want to download the model
- Tap "View"
- Observe that the model thumbnail is displayed, rather than going into an AR QuickLook session. 

See attached screenshots.

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