fix closing search dropdown (#1142)

* using a different library for javascript selects, fixing the closing search dropdown
* fix closing dropdown for daterangepicker
* added missing search button for mobile on customer page
* fix meta fields with same names than existing columns

tests/Event/UserPreferenceDisplayEventTest.php

@@ -0,0 +1,34 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Event;
+
+use App\Entity\UserPreference;
+use App\Event\UserPreferenceDisplayEvent;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \App\Event\UserPreferenceDisplayEvent
+ */
+class UserPreferenceDisplayEventTest extends TestCase
+{
+    public function testGetterAndSetter()
+    {
+        $sut = new UserPreferenceDisplayEvent('blub');
+        self::assertEquals('blub', $sut->getLocation());
+        self::assertIsArray($sut->getPreferences());
+        self::assertEmpty($sut->getPreferences());
+
+        $preference = new UserPreference();
+        $preference->setName('foo')->setValue('bar');
+        $sut->addPreference($preference);
+
+        self::assertEquals([$preference], $sut->getPreferences());
+    }
+}