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

Change-Id: Ic770e707e06ad743dea2f70dd8904d21eb50774f
diff --git a/dev/js/src/hint/input.js b/dev/js/src/hint/input.js
index 7145919..adb74b6 100644
--- a/dev/js/src/hint/input.js
+++ b/dev/js/src/hint/input.js
@@ -58,6 +58,14 @@
 
 
   /**
+     * Reset the input value
+   */
+  reset : function () {
+    this._element.value = "";
+  },
+
+
+  /**
    * Update the mirror content.
    */
   update : function () {
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);
     },
diff --git a/dev/js/src/hint/menu.js b/dev/js/src/hint/menu.js
index dd99d1f..c5c7cc7 100644
--- a/dev/js/src/hint/menu.js
+++ b/dev/js/src/hint/menu.js
@@ -48,12 +48,14 @@
 
     /**
      * Hide the menu just for the moment,
-     * without cleaning up anything.
+     * without cleaning up anything,
+     /* but resetting the prefix.
      */
     hideWithoutDestruction : function () {
       this.element().classList.remove("visible");
-      if (this._hint)
+      if (this._hint) {
         this._hint.inputField().element().focus();
+      };
     }
   };
 });