Update the search object and the actions in a more user friendly way

* I've tidied up the code changes I made at 910accd (removed the tempNewObject and tempCurrentObject objects)
* Added the changes I made in 910accd to the `setObjectValue` method (to reduce the number of 'searchObjectChanged' messages sent)
* Added the previous and current objects to the QSSearchObjectChanged `userInfo` dictionary (so that methods receiving the notif can see the different)
* Made the actions reload only if the previous and new object's types are different (if the types are the same then the actions will be the same)
* Altered the `updateActions` and `updateActionsNow` methods so that the latter clears the action pane. This means that you won't get a 'blinking' effect for 0.1s (the time between `updateActions` and `updateActionsNow` being called) while the 2nd pane is empty

Quicksilver/Code-QuickStepInterface/QSInterfaceController.m

@@ -291,12 +291,14 @@ - (NSArray *)rankedActions {
 }
 
 - (void)updateActions {
-	[aSelector setResultArray:nil];
-	[aSelector clearObjectValue];
+    // update the actions after a delay (see setActionUpdateTimer for the delay length)
 	[self performSelectorOnMainThread:@selector(setActionUpdateTimer) withObject:nil waitUntilDone:YES];
 }
 
 - (void)updateActionsNow {
+    // Clear the current results in the aSelector ready for the new results
+    [aSelector setResultArray:nil];
+    [aSelector clearObjectValue];
 	[actionsUpdateTimer invalidate];
 
 	[aSelector setEnabled:YES];
@@ -390,12 +392,18 @@ - (void)objectIconModified:(NSNotification *)notif {
 
 }
 
+/* [notif userInfo] contains 2 objects and keys: a 'previousObject' key and a 'currentObject' key
+ corresponding to the previously selected object and the current selected object respectively */
 - (void)searchObjectChanged:(NSNotification*)notif {
 	[[self window] disableFlushWindow];
 	if ([notif object] == dSelector) {
+        // If the previous and current objects have the same primary type, don't update the action
+        if (![[[[notif userInfo] objectForKey:@"previousObject"] types] isEqual:[[[notif userInfo] objectForKey:@"currentObject"] types]]
+            ) {
 		[iSelector setObjectValue:nil];
 		[self updateActions];
 		[self updateViewLocations];
+        }
 	} else if ([notif object] == aSelector) {
         QSAction *obj = [aSelector objectValue];
         if ([obj isKindOfClass:[QSRankedObject class]])

Quicksilver/Code-QuickStepInterface/QSSearchObjectView.m

@@ -584,29 +584,38 @@ - (IBAction)updateResultView:(id)sender {
 #pragma mark Object Value
 - (void)selectObjectValue:(QSObject *)newObject {
     QSObject *currentObject = [self objectValue];
-    QSObject *tempNewObject;
-    QSObject *tempCurrentObject;
+
+    // resolve the current and new objects in order to compare them
     if ([newObject isKindOfClass:[QSRankedObject class]]) {
-        tempNewObject = [(QSRankedObject *)newObject object];
+        newObject = [(QSRankedObject *)newObject object];
     }
     if ([currentObject isKindOfClass:[QSRankedObject class]]) {
-        tempCurrentObject = [(QSRankedObject *)currentObject object];
+        currentObject = [(QSRankedObject *)currentObject object];
     }
-	if ((tempNewObject ? tempNewObject : newObject) != (tempCurrentObject ? tempCurrentObject : currentObject)) {
+    // if the two objects are not the same, send an 'object chagned' notif
+	if (newObject != currentObject) {
 		[super setObjectValue:newObject];
-		[[NSNotificationCenter defaultCenter] postNotificationName:@"SearchObjectChanged" object:self];
+		[[NSNotificationCenter defaultCenter] postNotificationName:@"SearchObjectChanged" object:self userInfo:[NSDictionary dictionaryWithObjectsAndKeys:currentObject,@"previousObject",newObject,@"currentObject",nil]];
 	}
 }
 
 - (void)setObjectValue:(QSBasicObject *)newObject {
-	//if (newObject) NSLog(@"%p set value %@", self, newObject);
-	[self hideResultView:self];
-	[self clearSearch];
-	[parentStack removeAllObjects];
-	[self setResultArray:[NSArray arrayWithObjects:newObject, nil]];
-	[super setObjectValue:newObject];
-
-	[[NSNotificationCenter defaultCenter] postNotificationName:@"SearchObjectChanged" object:self];
+    QSObject *currentObject = [self objectValue];
+    if ([newObject isKindOfClass:[QSRankedObject class]]) {
+        newObject = [(QSRankedObject *)newObject object];
+    }
+    if ([currentObject isKindOfClass:[QSRankedObject class]]) {
+        currentObject = [(QSRankedObject *)currentObject object];
+    }
+	if (newObject != currentObject) {
+        [self hideResultView:self];
+        [self clearSearch];
+        [parentStack removeAllObjects];
+        [self setResultArray:[NSArray arrayWithObjects:newObject, nil]];
+        [super setObjectValue:newObject];
+
+		[[NSNotificationCenter defaultCenter] postNotificationName:@"SearchObjectChanged" object:self userInfo:[NSDictionary dictionaryWithObjectsAndKeys:currentObject,@"previousObject",newObject,@"currentObject",nil]];
+    }
 }
 
 - (void)clearObjectValue {