Widgets: Prevent image `title` attribute from being populated from attachment `title` by default upon selection.

Props westonruter, timmydcrawford.
See #39993.


git-svn-id: https://develop.svn.wordpress.org/trunk@40670 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/js/widgets/media-image-widget.js

@@ -108,6 +108,22 @@
 			);
 		},
 
+		/**
+		 * Get the instance props from the media selection frame.
+		 *
+		 * Prevent the image_title attribute from being initially set when adding an image from the media library.
+		 *
+		 * @param {wp.media.view.MediaFrame.Select} mediaFrame - Select frame.
+		 * @returns {Object} Props.
+		 */
+		getModelPropsFromMediaFrame: function getModelPropsFromMediaFrame( mediaFrame ) {
+			var control = this;
+			return _.omit(
+				component.MediaWidgetControl.prototype.getModelPropsFromMediaFrame.call( control, mediaFrame ),
+				'image_title'
+			);
+		},
+
 		/**
 		 * Map model props to preview template props.
 		 *