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diff --git a/vendor/oojs/oojs-ui/src/widgets/OutlineOptionWidget.js b/vendor/oojs/oojs-ui/src/widgets/OutlineOptionWidget.js
new file mode 100644
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+++ b/vendor/oojs/oojs-ui/src/widgets/OutlineOptionWidget.js
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+/**
+ * OutlineOptionWidget is an item in an {@link OO.ui.OutlineSelectWidget OutlineSelectWidget}.
+ *
+ * Currently, this class is only used by {@link OO.ui.BookletLayout booklet layouts}, which contain
+ * {@link OO.ui.PageLayout page layouts}. See {@link OO.ui.BookletLayout BookletLayout}
+ * for an example.
+ *
+ * @class
+ * @extends OO.ui.DecoratedOptionWidget
+ *
+ * @constructor
+ * @param {Object} [config] Configuration options
+ * @cfg {number} [level] Indentation level
+ * @cfg {boolean} [movable] Allow modification from {@link OO.ui.OutlineControlsWidget outline controls}.
+ */
+OO.ui.OutlineOptionWidget = function OoUiOutlineOptionWidget( config ) {
+	// Configuration initialization
+	config = config || {};
+
+	// Parent constructor
+	OO.ui.OutlineOptionWidget.super.call( this, config );
+
+	// Properties
+	this.level = 0;
+	this.movable = !!config.movable;
+	this.removable = !!config.removable;
+
+	// Initialization
+	this.$element.addClass( 'oo-ui-outlineOptionWidget' );
+	this.setLevel( config.level );
+};
+
+/* Setup */
+
+OO.inheritClass( OO.ui.OutlineOptionWidget, OO.ui.DecoratedOptionWidget );
+
+/* Static Properties */
+
+OO.ui.OutlineOptionWidget.static.highlightable = false;
+
+OO.ui.OutlineOptionWidget.static.scrollIntoViewOnSelect = true;
+
+OO.ui.OutlineOptionWidget.static.levelClass = 'oo-ui-outlineOptionWidget-level-';
+
+OO.ui.OutlineOptionWidget.static.levels = 3;
+
+/* Methods */
+
+/**
+ * Check if item is movable.
+ *
+ * Movability is used by {@link OO.ui.OutlineControlsWidget outline controls}.
+ *
+ * @return {boolean} Item is movable
+ */
+OO.ui.OutlineOptionWidget.prototype.isMovable = function () {
+	return this.movable;
+};
+
+/**
+ * Check if item is removable.
+ *
+ * Removability is used by {@link OO.ui.OutlineControlsWidget outline controls}.
+ *
+ * @return {boolean} Item is removable
+ */
+OO.ui.OutlineOptionWidget.prototype.isRemovable = function () {
+	return this.removable;
+};
+
+/**
+ * Get indentation level.
+ *
+ * @return {number} Indentation level
+ */
+OO.ui.OutlineOptionWidget.prototype.getLevel = function () {
+	return this.level;
+};
+
+/**
+ * Set movability.
+ *
+ * Movability is used by {@link OO.ui.OutlineControlsWidget outline controls}.
+ *
+ * @param {boolean} movable Item is movable
+ * @chainable
+ */
+OO.ui.OutlineOptionWidget.prototype.setMovable = function ( movable ) {
+	this.movable = !!movable;
+	this.updateThemeClasses();
+	return this;
+};
+
+/**
+ * Set removability.
+ *
+ * Removability is used by {@link OO.ui.OutlineControlsWidget outline controls}.
+ *
+ * @param {boolean} movable Item is removable
+ * @chainable
+ */
+OO.ui.OutlineOptionWidget.prototype.setRemovable = function ( removable ) {
+	this.removable = !!removable;
+	this.updateThemeClasses();
+	return this;
+};
+
+/**
+ * Set indentation level.
+ *
+ * @param {number} [level=0] Indentation level, in the range of [0,#maxLevel]
+ * @chainable
+ */
+OO.ui.OutlineOptionWidget.prototype.setLevel = function ( level ) {
+	var levels = this.constructor.static.levels,
+		levelClass = this.constructor.static.levelClass,
+		i = levels;
+
+	this.level = level ? Math.max( 0, Math.min( levels - 1, level ) ) : 0;
+	while ( i-- ) {
+		if ( this.level === i ) {
+			this.$element.addClass( levelClass + i );
+		} else {
+			this.$element.removeClass( levelClass + i );
+		}
+	}
+	this.updateThemeClasses();
+
+	return this;
+};