Significant speed improvement on opening typeahead

src/bootstrap/choices.tpl.html

@@ -1,10 +1,10 @@
 <ul class="ui-select-choices ui-select-choices-content ui-select-dropdown dropdown-menu"
     role="listbox"
     ng-show="$select.items.length > 0">
-  <li class="ui-select-choices-group" id="ui-select-choices-{{ $select.generatedId }}" >
+  <li class="ui-select-choices-group" ng-show="$select.open" id="ui-select-choices-{{ $select.generatedId }}" >
     <div class="divider" ng-show="$select.isGrouped && $index > 0"></div>
     <div ng-show="$select.isGrouped" class="ui-select-choices-group-label dropdown-header" ng-bind="$group.name"></div>
-    <div id="ui-select-choices-row-{{ $select.generatedId }}-{{$index}}" class="ui-select-choices-row" 
+    <div id="ui-select-choices-row-{{ $select.generatedId }}-{{$index}}" class="ui-select-choices-row"
     ng-class="{active: $select.isActive(this), disabled: $select.isDisabled(this)}" role="option">
       <a href="javascript:void(0)" class="ui-select-choices-row-inner"></a>
     </div>

src/selectize/choices.tpl.html

@@ -1,4 +1,4 @@
-<div ng-show="$select.open" class="ui-select-choices ui-select-dropdown selectize-dropdown single">
+<div class="ui-select-choices ui-select-dropdown selectize-dropdown single">
   <div class="ui-select-choices-content selectize-dropdown-content">
     <div class="ui-select-choices-group optgroup" role="listbox">
       <div ng-show="$select.isGrouped" class="ui-select-choices-group-label optgroup-header" ng-bind="$group.name"></div>

src/uiSelectChoicesDirective.js

@@ -40,7 +40,6 @@ uis.directive('uiSelectChoices',
         }
 
         choices.attr('ng-repeat', RepeatParser.getNgRepeatExpression($select.parserResult.itemName, '$select.items', $select.parserResult.trackByExp, groupByExp))
-            .attr('ng-if', '$select.open') //Prevent unnecessary watches when dropdown is closed
             .attr('ng-mouseenter', '$select.setActiveItem('+$select.parserResult.itemName +')')
             .attr('ng-click', '$select.select(' + $select.parserResult.itemName + ',false,$event)');