Bug 307601 – dataTransfer.types includes "Files" but dataTransfer.files is empty when dragging images from Mail.app

• Status: RESOLVED
• Resolution: FIXED
• Component: New Bugs

Steps to reproduce:
  1. Open an email in Mail.app that contains an inline image
  2. Drag the inline image to a web page with a drop zone
  3. In the drop event handler, check dataTransfer.types and dataTransfer.files

  Expected: If "Files" is in dataTransfer.types, dataTransfer.files should contain the file

  Actual: dataTransfer.types is ["Files", "text/html"], but dataTransfer.files.length is 0

  Additional observations:
  - dataTransfer.items shows only 1 item with kind="string" (the HTML)
  - The HTML contains: <img src="blob:null/..." ...> which is inaccessible
  - Dragging from Notes.app works correctly (files are accessible)
  - This may be related to Bug 217726 https://bugs.webkit.org/show_bug.cgi?id=217726

[Radar WebKit Bug Importer]

<rdar://problem/170672606>

Pull request: https://github.com/WebKit/WebKit/pull/64312

[EWS]

Committed 312711@main (9a5dd61958c8): <https://commits.webkit.org/312711@main>

Reviewed commits have been landed. Closing PR #64312 and removing active labels.