Merge "Avoid launching dialogs twice from double-clicking a preference." into jb-dev

Author: Amith Yamasani

core/java/android/preference/DialogPreference.java

@@ -261,6 +261,8 @@ protected void onPrepareDialogBuilder(AlertDialog.Builder builder) {
 
     @Override
     protected void onClick() {
+        if (mDialog != null && mDialog.isShowing()) return;
+
         showDialog(null);
     }