Clean prefix of annotation assistant, in case a menu item is chosen

Change-Id: Ic770e707e06ad743dea2f70dd8904d21eb50774f
diff --git a/dev/js/src/hint/item.js b/dev/js/src/hint/item.js
index c39c3c2..47d332b 100644
--- a/dev/js/src/hint/item.js
+++ b/dev/js/src/hint/item.js
@@ -50,12 +50,15 @@
       var h = m.hint();
       // m.hide();
 
+      // Reset prefix
+      m.prefix("");
+
       // Update input field
       var input = h.inputField();
       input.insert(this._action).update();
 
       e.halt();
-
+     
       // show alt
       h.show(true);
     },