redo [6731] using the built-in stringByTrimmingCharactersInSet:

macosx/CreatorWindowController.m

@@ -311,7 +311,7 @@
 {
     NSString * tracker = (NSString *)object;
     
-    tracker = [tracker stringByTrimmingWhitespace];
+    tracker = [tracker stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
     
     if ([tracker rangeOfString: @"://"].location == NSNotFound)
         tracker = [@"http://" stringByAppendingString: tracker];

macosx/NSStringAdditions.h

@@ -29,8 +29,6 @@
 + (NSString *) ellipsis;
 - (NSString *) stringByAppendingEllipsis;
 
-- (NSString *) stringByTrimmingWhitespace;
-
 + (NSString *) stringForFileSize: (uint64_t) size;
 
 + (NSString *) stringForSpeed: (float) speed;

macosx/NSStringAdditions.m

@@ -38,19 +38,6 @@
 	return [self stringByAppendingString: [NSString ellipsis]];
 }
 
-- (NSString *) stringByTrimmingWhitespace
-{
-    NSString * newString = self;
-    while ([newString length] > 0 && [[NSCharacterSet whitespaceAndNewlineCharacterSet] characterIsMember:
-                                        [newString characterAtIndex: [newString length] - 1]])
-        newString = [newString substringToIndex: [newString length] - 1];
-    while ([newString length] > 0 && [[NSCharacterSet whitespaceAndNewlineCharacterSet] characterIsMember:
-                                        [newString characterAtIndex: 0]])
-        newString = [newString substringFromIndex: 1];
-    
-    return newString;
-}
-
 + (NSString *) stringForFileSize: (uint64_t) size
 {
     if (size < 1024)

macosx/Torrent.m

@@ -809,7 +809,7 @@ void completenessChangeCallback(tr_torrent * torrent, cp_status_t status, void *
     
     NSString * tracker = [trackers objectAtIndex: i];
     
-    tracker = [tracker stringByTrimmingWhitespace];
+    tracker = [tracker stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
     
     if ([tracker rangeOfString: @"://"].location == NSNotFound)
     {