src/vs/workbench/contrib/webview/browser/webviewElement.ts/WebviewElement/windowDidDragStart
class WebviewElement:	windowDidDragStart(): void {
		// Webview break drag and dropping around the main window (no events are generated when you are over them)
		// Work around this by disabling pointer events during the drag.
		// https://github.com/electron/electron/issues/18226
		this._startBlockingIframeDragEvents();
	}