File::addMessage(): do not ignore Internal errors when scanning selectively

When either the `--sniffs=...` CLI parameter is used, or the `--exclude=...` CLI parameter, the `File::addMessage()` method bows out when an error is passed which is not for one of the selected sniffs/is for one of the excluded sniffs.

Unfortunately, this "bowing out" did not take `Internal` errors into account, meaning those were now hidden, while those should _always_ be thrown as they generally inform the end-user of something seriously wrong (mixed line endings/no code found etc).

Fixed now.

Includes updating three test files to allow for seeing internal errors.

Author: jrfnl

src/Files/File.php

@@ -879,6 +879,7 @@ protected function addMessage($error, $message, $line, $column, $code, $data, $s
         // Filter out any messages for sniffs that shouldn't have run
         // due to the use of the --sniffs command line argument.
         if ($includeAll === false
+            && $parts[0] !== 'Internal'
             && ((empty($this->configCache['sniffs']) === false
             && in_array(strtolower($listenerCode), $this->configCache['sniffs'], true) === false)
             || (empty($this->configCache['exclude']) === false

src/Standards/Generic/Tests/PHP/BacktickOperatorUnitTest.php

@@ -43,8 +43,8 @@ public function getErrorList()
      */
     public function getWarningList()
     {
-        // Warning about incorrect annotation will be shown on line 1 once PR #3915 would be merged.
-        return [];
+        // Warning about incorrect annotation.
+        return [1 => 1];
 
     }//end getWarningList()
 

src/Standards/Generic/Tests/PHP/DisallowAlternativePHPTagsUnitTest.php

@@ -56,7 +56,15 @@ public function getErrorList($testFile='')
     public function getWarningList($testFile='')
     {
         if ($testFile === 'DisallowAlternativePHPTagsUnitTest.2.inc') {
+            // Check if the Internal.NoCodeFound error can be expected on line 1.
+            $option = (bool) ini_get('short_open_tag');
+            $line1  = 1;
+            if ($option === true) {
+                $line1 = 0;
+            }
+
             return [
+                1 => $line1,
                 2 => 1,
                 3 => 1,
                 4 => 1,

src/Standards/Generic/Tests/PHP/DisallowShortOpenTagUnitTest.php

@@ -88,7 +88,14 @@ public function getWarningList($testFile='')
         case 'DisallowShortOpenTagUnitTest.1.inc':
             return [];
         case 'DisallowShortOpenTagUnitTest.3.inc':
+            // Check if the Internal.NoCodeFound error can be expected on line 1.
+            $option = (bool) ini_get('short_open_tag');
+            $line1  = 1;
+            if ($option === true) {
+                $line1 = 0;
+            }
             return [
+                1  => $line1,
                 3  => 1,
                 6  => 1,
                 11 => 1,