Bug 181596 – Drag is prevented on video elements without controls attribute

• Component: Media
• Status: NEW

[Scott Steele]

Overview:
Video elements without the controls attribute should support drag.

Steps to reproduce:
1. Create a webpage with a video element without the controls attribute as a child of a draggable div.
2. Cause the video to be reloaded and played.
3. Select and attempt to drag the video.

Actual results:
Video element does not drag. dragend is fired immediately.

Expected results:
Video element is draggable.  dragend is fired only after the mouse button is released.

Other useful information:
In /Source/WebCore/Modules/modern-media-controls/controls/media-controls.js, dragstart is cancelled in handleEvent() as follows:

+    handleEvent(event)
     {
+        if (event.type === "focusin" && event.currentTarget === this.element)
+            this.faded = false;
+        else if (event.type === "dragstart" && this.isPointInControls(new DOMPoint(event.clientX, event.clientY)))
+            event.preventDefault();
     }

Instead, drag should only be prevented when the controls attribute is present on the media element.

[Radar WebKit Bug Importer]

<rdar://problem/36540541>