Focus the search upon opening

dist/js/select2.amd.full.js

@@ -1510,6 +1510,8 @@ define('select2/dropdown/search',[
 
     container.on('open', function () {
       self.$search.attr('tabindex', 0);
+
+      self.$search.focus();
     });
 
     container.on('close', function () {

dist/js/select2.amd.js

@@ -1510,6 +1510,8 @@ define('select2/dropdown/search',[
 
     container.on('open', function () {
       self.$search.attr('tabindex', 0);
+
+      self.$search.focus();
     });
 
     container.on('close', function () {

dist/js/select2.full.js

@@ -11045,6 +11045,8 @@ define('select2/dropdown/search',[
 
     container.on('open', function () {
       self.$search.attr('tabindex', 0);
+
+      self.$search.focus();
     });
 
     container.on('close', function () {

dist/js/select2.js

@@ -1938,6 +1938,8 @@ define('select2/dropdown/search',[
 
     container.on('open', function () {
       self.$search.attr('tabindex', 0);
+
+      self.$search.focus();
     });
 
     container.on('close', function () {

src/js/select2/dropdown/search.js

@@ -37,6 +37,8 @@ define([
 
     container.on('open', function () {
       self.$search.attr('tabindex', 0);
+
+      self.$search.focus();
     });
 
     container.on('close', function () {