bug #3004 Fix support for PHP 7.4 (fabpot)

This PR was squashed before being merged into the 1.x branch (closes #3004).

Discussion
----------

Fix support for PHP 7.4

Commits
-------

f958bd1 fixed deprecation under PHP 7.4
1fb0f97 fixed PHP 7.4 support
7be8e94 added PHP 7.4 in Travis config

.travis.yml

@@ -38,6 +38,7 @@ jobs:
         - php: 7.1
         - php: 7.2
         - php: 7.3
+        - php: 7.4snapshot
         - stage: integration tests
           php: 7.3
           script: ./drupal_test.sh

CHANGELOG

@@ -1,5 +1,6 @@
 * 1.41.0 (2019-XX-XX)
 
+ * fixed support for PHP 7.4
  * added "filter", "map", and "reduce" filters (and support for arrow functions)
  * fixed partial output leak when a PHP fatal error occurs
  * optimized context access on PHP 7.4

src/Lexer.php

@@ -262,7 +262,7 @@ protected function lexData()
             if ($this->options['whitespace_trim'] === $this->positions[2][$this->position][0]) {
                 // whitespace_trim detected ({%-, {{- or {#-)
                 $text = rtrim($text);
-            } else {
+            } elseif ($this->options['whitespace_line_trim'] === $this->positions[2][$this->position][0]) {
                 // whitespace_line_trim detected ({%~, {{~ or {#~)
                 // don't trim \r and \n
                 $text = rtrim($text, " \t\0\x0B");

src/Node/Node.php

@@ -40,7 +40,7 @@ public function __construct(array $nodes = [], array $attributes = [], $lineno =
     {
         foreach ($nodes as $name => $node) {
             if (!$node instanceof \Twig_NodeInterface) {
-                @trigger_error(sprintf('Using "%s" for the value of node "%s" of "%s" is deprecated since version 1.25 and will be removed in 2.0.', \is_object($node) ? \get_class($node) : null === $node ? 'null' : \gettype($node), $name, \get_class($this)), E_USER_DEPRECATED);
+                @trigger_error(sprintf('Using "%s" for the value of node "%s" of "%s" is deprecated since version 1.25 and will be removed in 2.0.', \is_object($node) ? \get_class($node) : (null === $node ? 'null' : \gettype($node)), $name, \get_class($this)), E_USER_DEPRECATED);
             }
         }
         $this->nodes = $nodes;