dist/jquery.fancytree-all-deps.js
function(flag) {
			flag = flag !== false; // Confusing use of '!'
			/*jshint -W018 */ if (!!this._enableUpdate === !!flag) {
				return flag;
			}
			/*jshint +W018 */
			this._enableUpdate = flag;
			if (flag) {
				this.debug("enableUpdate(true): redraw "); //, this._dirtyRoots);
				this.render();
			} else {
				// 	this._dirtyRoots = null;
				this.debug("enableUpdate(false)...");
			}
			return !flag; // return previous value
		}
function(flag) {
			flag = flag !== false; // Confusing use of '!'
			/*jshint -W018 */ if (!!this._enableUpdate === !!flag) {
				return flag;
			}
			/*jshint +W018 */
			this._enableUpdate = flag;
			if (flag) {
				this.debug("enableUpdate(true): redraw "); //, this._dirtyRoots);
				this.render();
			} else {
				// 	this._dirtyRoots = null;
				this.debug("enableUpdate(false)...");
			}
			return !flag; // return previous value
		}
function ( flag ) { flag = flag !== false ; // Confusing use of '!' /*jshint -W018 */ if ( ! ! this . _enableUpdate === ! ! flag ) { return flag ; } /*jshint +W018 */ this . _enableUpdate = flag ; if ( flag ) { this . debug ( "enableUpdate(true): redraw " ) ; //, this._dirtyRoots); this . render ( ) ; } else { // 	this._dirtyRoots = null; this . debug ( "enableUpdate(false)..." ) ; } return ! flag ; // return previous value }
Temporarily suppress rendering to improve performance on bulk-updates.

@param {boolean} flag
@returns {boolean} previous status
@since 2.19
Temporarily suppress rendering to improve performance on bulk - updates .