Extensions specified on the CLI are now merged with those set in rule…

…set.xml files

CodeSniffer/CLI.php

@@ -686,7 +686,7 @@ public function processLongArgument($arg, $pos)
                     $this->values['standard'] = explode(',', $standards);
                 }
             } else if (substr($arg, 0, 11) === 'extensions=') {
-                $this->values['extensions'] = explode(',', substr($arg, 11));
+                $this->values['extensions'] = array_merge($this->values['extensions'], explode(',', substr($arg, 11)));
             } else if (substr($arg, 0, 9) === 'severity=') {
                 $this->values['errorSeverity']   = (int) substr($arg, 9);
                 $this->values['warningSeverity'] = $this->values['errorSeverity'];

package.xml

@@ -40,6 +40,8 @@ http://pear.php.net/dtd/package-2.0.xsd">
     -- Useful for running the phpcs and phpcbf commands without any arguments at the top of a repository
   - Default file paths can now be specified in a ruleset.xml file using the "file" tag
     -- File paths are only processed if no files were specified on the command line
+  - Extensions specified on the CLI are now merged with those set in ruleset.xml files
+    -- Previously, the ruleset.xml file setting replaced the CLI setting completely
   - Squiz coding standard now requires lowercase PHP constants (true, false and null)
     -- Removed Squiz.NamingConventions.ConstantCase sniff as the rule is now consistent across PHP and JS files
   - Squiz FunctionOpeningBraceSpaceSniff no longer does additional checks for JS functions