[Webkit-unassigned] [Bug 254046] New: `dragend` events have incorrect coordinates

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=254046

            Bug ID: 254046
           Summary: `dragend` events have incorrect coordinates
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Intel)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: avi at drissman.com
                CC: wenson_hsieh at apple.com

Created attachment 465467

  --> https://bugs.webkit.org/attachment.cgi?id=465467&action=review

a sample illustrating the issue

For an item that is being dragged, as the drag proceeds, “drag” events are fired, and then, when the drag is complete, a “dragend” event is fired.

In Safari Version 16.3 (18614.4.6.1.6) as well as Safari Technology Preview Release 165 (Safari 16.4, WebKit 18616.1.4.4), the coordinates in the “dragend” event are incorrect. They should roughly match the coordinates of the last move.

To repro:
0. download the attached repro file (which logs the coordinates passed to the event listeners)
1. open the file
2. open the console for the page
3. drag the block of text on the page
4. stop the drag

Expected:
- The “dragend” event coordinates should roughly match the coordinates of the last “drag” event coordinates

Actual:
- The “dragend” event coordinates do not match the coordinates of the last “drag” event coordinates, and are very incorrect in relation to the client (e.g. if you drop near the upper left corner of the screen, the last “drag” event coordinates will be small and single-digit while the “dragend” coordinates will be in the 300-900 range)

This is reproducible on my iMac Pro, with aforementioned Safari and STP, on macOS 13.2.1 (22D68).

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