Fix an exception when changing the tab indentation while the Bundle Editor is open (fixes #2246)

Author: dmoagx

Source/SPBundleCommandTextView.m

@@ -816,6 +816,13 @@ - (void)boundsDidChangeNotification:(NSNotification *)notification
 	[commandScrollView display];
 }
 
+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
+{
+	if([keyPath isEqualToString:SPCustomQueryEditorTabStopWidth]) {
+		[self setTabStops];
+	}
+}
+
 #pragma mark -
 
 // Store the font in the prefs for selected delegates only