Typo3: Filelist context menu does not work

If the context menu of your typo3 file list does not work anymore and you use templavoilá, you might hit a known bug in one of templavoilá’s functions.
http://forge.typo3.org/issues/43554

To check if this is the case:

• Use a browser developer tool such as chrome developer console (hit F12 in your browser), and check for an 500 internal error response for a url similar to …./alt_clickmenu.php?…
• Next, check your templavoila version. If this is 1.8.0: there you go

There is already a patch provided for this issue:
http://forge.typo3.org/attachments/23132/

To fix this manually, edit the file typo3conf/ext/templavoila/classes/class.tx_templavoila_file.php

In the method public static function is_xmlFile($filename), adapt the following lines:

public static function is_xmlFile($filename) {
  if (!self::includesFal()) {
    // fix file list context menu according to http://forge.typo3.org/attachments/23132/43554.patch
    // return self::is_xmlFile($filename);
    return self::is_xmlFile_finfo($filename);
}