[Webkit-unassigned] [Bug 252474] New: REGRESSION: Opening projects broken in Construct 3 web app with Safari TP 163

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=252474

            Bug ID: 252474
           Summary: REGRESSION: Opening projects broken in Construct 3 web
                    app with Safari TP 163
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ashley at scirra.com

Created attachment 465052

  --> https://bugs.webkit.org/attachment.cgi?id=465052&action=review

A sample project file that our web app can open

This is a major regression that more or less completely breaks our web app Construct 3. Currently only Safari TP 163 is affected - I hope this doesn't make its way to stable!

Steps to reproduce:

1. Download sample-project.zip from this bug report
2. Visit https://editor.construct.net
3. Close/cancel any dialogs that appear
4. Drag and drop sample-project.zip in to the browser window. This will cause the web app to open the dropped file.

Observed result:

A "Failed to open project" message is shown. A JSON parse error is logged to the console.

Expected result:

The project file to successfully open. It works correctly in the current main Safari release 16.3, and also in Chrome. It looks like a recent change to Safari broke this.

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