bundles/org.eclipse.orion.client.ui/web/orion/explorers/explorerNavHandler.js
function(e) {
			this.iterate(false, false, e.shiftKey, true);
			if(!this._ctrlKeyOn(e) && !e.shiftKey){
				this.setSelection(this.currentModel(), false, true);
			}
			e.preventDefault();
			return false;
		}
function(e) {
			this.iterate(false, false, e.shiftKey, true);
			if(!this._ctrlKeyOn(e) && !e.shiftKey){
				this.setSelection(this.currentModel(), false, true);
			}
			e.preventDefault();
			return false;
		}
function ( e ) { this . iterate ( false , false , e . shiftKey , true ) ; if ( ! this . _ctrlKeyOn ( e ) && ! e . shiftKey ) { this . setSelection ( this . currentModel ( ) , false , true ) ; } e . preventDefault ( ) ; return false ; }
Up arrow key iterates the current row backward. If control key is on, browser's scroll up behavior takes over. If shift key is on, it toggles the check box and iterates backward.
Up arrow key iterates the current row backward . If control key is on browser s scroll up behavior takes over . If shift key is on it toggles the check box and iterates backward .