Added fix for ignoring shortcut key combinations, added sinon js for unit testing

js/bootstrap-combobox.js

@@ -397,8 +397,10 @@
           break;
 
         default:
-          this.clearTarget();
-          this.lookup();
+          if (!e.altKey && !e.ctrlKey && !e.metaKey) {
+            this.clearTarget();
+            this.lookup();
+          }
       }
 
       e.stopPropagation();

js/tests/index.html

@@ -11,6 +11,9 @@
   <link rel="stylesheet" href="vendor/qunit.css" type="text/css" media="screen" />
   <script src="vendor/qunit.js"></script>
 
+  <!-- sinon -->
+  <script src="vendor/sinon.js"></script>
+
   <!--  plugin sources -->
   <script src="../../js/bootstrap-combobox.js"></script>
 

js/tests/unit/bootstrap-combobox.js

@@ -320,4 +320,25 @@ $(function () {
 
         combobox.$menu.remove()
       })
+
+      test("should not show menu when shortcut combination query entered", function () {
+        var $select = $('<select title="A title" disabled><option></option><option>aa</option><option selected>ab</option><option>ac</option></select>')
+          , $input = $select.combobox().data('combobox').$element
+          , combobox = $select.data('combobox')
+          , key_event = $.Event('keyup')
+          , spy = sinon.spy(combobox, 'lookup')
+
+        key_event.keyCode = 65
+        key_event.ctrlKey = true
+
+        $input.trigger(key_event)
+
+        equal(spy.callCount, 0, 'lookup not called')
+        equal(combobox.$menu.find('li').length, 0, 'has 0 items in menu')
+        equal(combobox.$menu.find('.active').length, 0, 'no items are active')
+
+        combobox.$menu.remove()
+        $select.remove()
+        combobox.$container.remove()
+      })
 })