[Webkit-unassigned] [Bug 217726] New: Drop event not firing when dragging file from MacOS mail app

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217726

            Bug ID: 217726
           Summary: Drop event not firing when dragging file from MacOS
                    mail app
           Product: WebKit
           Version: Safari 14
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: owain at apple.com

Created attachment 411366

  --> https://bugs.webkit.org/attachment.cgi?id=411366&action=review

Example file

When trying to drag a .eml file from the mail app to a DOM element in Safari 14.0.1 that's listening for drag/drop events, the drop event does not fire as expected (Drop event fires in latest Chrome).

Steps to Reproduce

---------------------------------------------------------------

Safari
- Open Attachment (example.html)
- Open web inspector tool and click on console

#1
- Drag file from desktop to the drop container (DOM element)
- Observe drop event DOES fire.

#2
- Drag .eml file from mail app to the drop container (DOM element)
- Observe drop event DOES NOT fire.


Expected Result: Drop event should fire in scenario #2.
Actual Result: Drop event does not fire at all.

---------------------------------------------------------------

Chrome
- Open Attachment (example.html) in Chrome
- Open web inspector tool and click on console

#1
- Drag file from desktop to the drop container (DOM element)
- Observe drop event DOES fire.

#2
- Drag .eml file from mail app to the drop container (DOM element)
- Observe drop event DOES fire.

Expected Result: Drop event should fire in scenario #2.
Actual Result: Drop event fires correctly.

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