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diff --git a/vendor/oojs/oojs-ui/src/widgets/ButtonGroupWidget.js b/vendor/oojs/oojs-ui/src/widgets/ButtonGroupWidget.js
new file mode 100644
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+++ b/vendor/oojs/oojs-ui/src/widgets/ButtonGroupWidget.js
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+/**
+ * A ButtonGroupWidget groups related buttons and is used together with OO.ui.ButtonWidget and
+ * its subclasses. Each button in a group is addressed by a unique reference. Buttons can be added,
+ * removed, and cleared from the group.
+ *
+ *     @example
+ *     // Example: A ButtonGroupWidget with two buttons
+ *     var button1 = new OO.ui.PopupButtonWidget( {
+ *         label: 'Select a category',
+ *         icon: 'menu',
+ *         popup: {
+ *             $content: $( '<p>List of categories...</p>' ),
+ *             padded: true,
+ *             align: 'left'
+ *         }
+ *     } );
+ *     var button2 = new OO.ui.ButtonWidget( {
+ *         label: 'Add item'
+ *     });
+ *     var buttonGroup = new OO.ui.ButtonGroupWidget( {
+ *         items: [button1, button2]
+ *     } );
+ *     $( 'body' ).append( buttonGroup.$element );
+ *
+ * @class
+ * @extends OO.ui.Widget
+ * @mixins OO.ui.GroupElement
+ *
+ * @constructor
+ * @param {Object} [config] Configuration options
+ * @cfg {OO.ui.ButtonWidget[]} [items] Buttons to add
+ */
+OO.ui.ButtonGroupWidget = function OoUiButtonGroupWidget( config ) {
+	// Configuration initialization
+	config = config || {};
+
+	// Parent constructor
+	OO.ui.ButtonGroupWidget.super.call( this, config );
+
+	// Mixin constructors
+	OO.ui.GroupElement.call( this, $.extend( {}, config, { $group: this.$element } ) );
+
+	// Initialization
+	this.$element.addClass( 'oo-ui-buttonGroupWidget' );
+	if ( Array.isArray( config.items ) ) {
+		this.addItems( config.items );
+	}
+};
+
+/* Setup */
+
+OO.inheritClass( OO.ui.ButtonGroupWidget, OO.ui.Widget );
+OO.mixinClass( OO.ui.ButtonGroupWidget, OO.ui.GroupElement );