Bug 664364 - Entering newline after Japanese in a textarea doesn't change cursor position. r=jchen

embedding/android/GeckoInputConnection.java

@@ -341,6 +341,14 @@ public class GeckoInputConnection
         mComposingText = text != null ? text.toString() : "";
 
         if (!mComposing) {
+            if (mComposingText.length() == 0) {
+                // Some IMEs such as iWnn sometimes call with empty composing 
+                // text.  (See bug 664364)
+                // If composing text is empty, ignore this and don't start
+                // compositing.
+                return true;
+            }
+
             // Get current selection
             GeckoAppShell.sendEventToGecko(
                 new GeckoEvent(GeckoEvent.IME_GET_SELECTION, 0, 0));