[CLEANUP] Call static methods statically (#670)

[CLEANUP] Call static methods statically In `CssConcatenator`, create `callable` for `static` method using `static::class` not `$this`. (Spotted in #669. Instances of `static` methods being called through `$this` were previously corrected in #525.)
MyIntervals · Jul 3, 2019 · 2a27b45 · 2a27b45
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -20,6 +20,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 ### Removed
 
 ### Fixed
+- Call all static methods statically in `CssConcatenator`
+  ([#670](https://github.com/MyIntervals/emogrifier/pull/670))
 - Support all HTML5 self-closing tags, including `<embed>`, `<source>`,
   `<track>` and `<wbr>`
   ([#653](https://github.com/MyIntervals/emogrifier/pull/653))

diff --git a/src/Emogrifier/CssConcatenator.php b/src/Emogrifier/CssConcatenator.php
@@ -87,7 +87,7 @@ public function append(array $selectors, $declarationsBlock, $media = '')
      */
     public function getCss()
     {
-        return \implode('', \array_map([$this, 'getMediaRuleCss'], $this->mediaRules));
+        return \implode('', \array_map([static::class, 'getMediaRuleCss'], $this->mediaRules));
     }
 
     /**