always unlock focus when drawing the inspector buttons

macosx/InfoTabButtonCell.m

@@ -96,9 +96,10 @@
                                             iconSize.width, iconSize.height);
         
         [fIcon drawInRect: iconRect fromRect: NSZeroRect operation: NSCompositeSourceOver fraction: 1.0];
-        [tabImage unlockFocus];
     }
     
+    [tabImage unlockFocus];
+    
     [self setImage: tabImage];
     [tabImage release];
 }