--- /home/hychen/codes/ibus-1.3.7/ui/gtk/panel.py	2010-10-12 13:13:25.000000000 +0800
+++ /usr/share/ibus/ui/gtk/panel.py	2010-10-13 02:10:01.222630894 +0800
@@ -541,7 +541,7 @@
 
         if not focus_ic:
             return
-        if engine:
+        if engine and not focus_ic.get_engine():
             focus_ic.set_engine(engine)
         else:
             focus_ic.disable()