Eliminated annoying flicker in Spotlight interface. Made tiny tweaks to PlaybackController and PlaylistController header to eliminate compiler warnings.

Application/PlaybackController.m

@@ -198,7 +198,7 @@ double linearToLogarithmic(double linear)
 
 - (IBAction)prev:(id)sender
 {
-	if ([playlistController prev] == nil)
+	if ([playlistController prev] == NO)
 		return;
 
 	[self stop:self];

Playlist/PlaylistController.h

@@ -41,6 +41,9 @@
 - (void)setRepeat:(BOOL)r;
 - (BOOL)repeat;
 
+- (PlaylistEntry *)getNextEntry:(PlaylistEntry *)pe;
+- (PlaylistEntry *)getPrevEntry:(PlaylistEntry *)pe;
+
 /* Methods for undoing various actions */
 - (NSUndoManager *)undoManager;
 

Spotlight/SpotlightTransformers.m

@@ -10,6 +10,7 @@
 
 @interface StringToURLTransformer: NSValueTransformer {}
 @end
+
 @implementation StringToURLTransformer
 + (Class)transformedValueClass { return [NSURL class]; }
 + (BOOL)allowsReverseTransformation { return YES; }
@@ -28,3 +29,5 @@
     return [value absoluteString];
 }
 @end
+
+@end

Spotlight/SpotlightWindowController.h

@@ -17,6 +17,7 @@
     NSMetadataQuery *query;
     NSString *searchString;
     NSString *spotlightSearchPath;
+    NSArray *oldResults;
 }
 
 - (IBAction)addToPlaylist:(id)sender;
@@ -27,5 +28,6 @@
 @property(retain) NSMetadataQuery *query;
 @property(copy) NSString *searchString;
 @property(copy) NSString *spotlightSearchPath;
+@property(retain) NSArray *oldResults;
 
 @end

Spotlight/SpotlightWindowController.m

@@ -189,6 +189,7 @@ static NSPredicate * musicOnlyPredicate = nil;
 	[self.query release];
 	[self.searchString release];
     [musicOnlyPredicate release];
+    [self.oldResults release];
 	[super dealloc];
 }
 
@@ -202,6 +203,19 @@ static NSPredicate * musicOnlyPredicate = nil;
    [self.query enableUpdates];
 }
 
+// Don't update the track list until some results have been gathered
+- (id)valueForKeyPath:(NSString *)keyPath
+{
+    if([keyPath isEqualToString:@"query.results"])
+    {
+        if(([self.query.results count] == 0) && [self.query isGathering])
+            return self.oldResults;
+        self.oldResults = [NSArray arrayWithArray:self.query.results];
+        return self.oldResults;
+    }
+    return [super valueForKeyPath:keyPath];
+}
+
 #pragma mark NSMetadataQuery delegate methods
 
 // replace the NSMetadataItem with a PlaylistEntry
@@ -249,4 +263,6 @@ replacementObjectForResultObject:(NSMetadataItem*)result
 	}
 }
 
+@synthesize oldResults;
+
 @end