Change the way the minify_exclude configurations can be used.

Author: hostep

app/code/Magento/Store/etc/config.xml

@@ -21,13 +21,13 @@
                 <merge_files>0</merge_files>
                 <minify_files>0</minify_files>
                 <minify_exclude>
-                    /tiny_mce/
+                    <tiny_mce>/tiny_mce/</tiny_mce>
                 </minify_exclude>
             </js>
             <css>
                 <minify_files>0</minify_files>
                 <minify_exclude>
-                    /tiny_mce/
+                    <tiny_mce>/tiny_mce/</tiny_mce>
                 </minify_exclude>
             </css>
             <image>

lib/internal/Magento/Framework/View/Asset/Minification.php

@@ -143,12 +143,26 @@ public function getExcludes($contentType)
         if (!isset($this->configCache[self::XML_PATH_MINIFICATION_EXCLUDES][$contentType])) {
             $this->configCache[self::XML_PATH_MINIFICATION_EXCLUDES][$contentType] = [];
             $key = sprintf(self::XML_PATH_MINIFICATION_EXCLUDES, $contentType);
-            foreach (explode("\n", $this->scopeConfig->getValue($key, $this->scope)) as $exclude) {
+            $excludeValues = $this->getMinificationExcludeValues($key);
+            foreach ($excludeValues as $exclude) {
                 if (trim($exclude) != '') {
                     $this->configCache[self::XML_PATH_MINIFICATION_EXCLUDES][$contentType][] = trim($exclude);
                 }
             }
         }
         return $this->configCache[self::XML_PATH_MINIFICATION_EXCLUDES][$contentType];
     }
+
+    /**
+     * Get minification exclude values from configuration
+     *
+     * @param string $key
+     * @return string[]
+     */
+    private function getMinificationExcludeValues($key)
+    {
+        $configValues = $this->scopeConfig->getValue($key, $this->scope) ?? [];
+
+        return array_values($configValues);
+    }
 }

lib/internal/Magento/Framework/View/Test/Unit/Asset/MinificationTest.php

@@ -203,10 +203,10 @@ public function testGetExcludes()
             ->expects($this->once())
             ->method('getValue')
             ->with('dev/js/minify_exclude')
-            ->willReturn(
-                "    /tiny_mce/  \n" .
-                "  /tiny_mce2/  "
-            );
+            ->willReturn([
+                'tiny_mce' => '/tiny_mce/',
+                'some_other_unique_name' => '/tiny_mce2/'
+            ]);
 
         $expected = ['/tiny_mce/', '/tiny_mce2/'];
         $this->assertEquals($expected, $this->minification->getExcludes('js'));