Patch provided by Martin Harvan: nicknames not fully displayed in tabs

https://sip-communicator.dev.java.net/servlets/BrowseList?list=dev&by=thread&from=1575137

src/net/java/sip/communicator/util/swing/plaf/SIPCommTabbedPaneEnhancedUI.java

@@ -393,6 +393,6 @@ protected int calculateTabWidth(int tabPlacement, int tabIndex,
                 width = PREFERRED_WIDTH;
         }
         
-        return width;
+        return width + WIDTHDELTA;
     }   
-}
+}