minor refactoring and fixes...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

ui (gen4)/features/core.js

@@ -726,7 +726,7 @@ var CacheActions = actions.Actions({
 	// 				}) }],
 	//
 	cache: function(title, lister){
-		if(!this.config.cache){
+		if(!(this.config || {}).cache){
 			return lister.call(this)
 		}
 		var cache = this.__cache = this.__cache || {}

ui (gen4)/features/store.js

@@ -65,19 +65,18 @@ var StoreActions = actions.Actions({
 	// 			.stores_actions		- dict of store-specific actions
 	get stores(){
 		return this.cache('stores', function(d){
-			var res = {}
-
-			this.actions.forEach(function(action){ 
+			return d ?
+				Object.assign({}, d)
+				: this.actions
+					.reduce(function(res, action){ 
 						var store = this.getActionAttr(action, 'handle_data_store')
 						res[store]
 							&& console.warn('Multiple handlers for store:', store)
 						if(store){
 							res[store] = action
 						}
-			}.bind(this))
-
 						return res
-		}) },
+					}.bind(this), {}) }) },
 
 	// events...
 	// XXX update signature -- see doc for: .loadStore(..)

ui (gen4)/features/ui-widgets.js

@@ -1949,12 +1949,17 @@ var BrowseActionsActions = actions.Actions({
 											getKeys('browseActions!: "'+ p +'"'), 
 										].filter(function(e){ return e.trim() != '' }).join(' / '),
 									},
+									// hide dirs containing only hidden stuff...
 									// XXX this will only check statically hidden stuff...
 									// 		...the rest may still get dynamically hidden...
 									hidden: options.no_hidden ? 
 										false
+										// hide dirs containing only (statically) 
+										// hidden items...
+										// NOTE: we are not checking browseMode 
+										// 		of other items actively here at 
+										// 		this point to avoid side-effects...
 										: Object.keys(cur[key])
-											// XXX we still need to check browseMode of each child...
 											.filter(function(k){ 
 												return (cur[key][k] || [])[1] != 'hidden' })
 								   			.length == 0,