Issue #3116611 by mondrake, andypost, cilefen, xeM8VfDh, alexpott, rkoller,...
Issue #3116611 by mondrake, andypost, cilefen, xeM8VfDh, alexpott, rkoller, benjifisher: Add a requirements check for GD support of allowed image types
$fix_info=$this->t('Check the <a href="https://www.php.net/manual/en/image.installation.php">PHP GD installation documentation</a> if you want to add support.');
$requirements['version']['description']=$this->t('The GD Library for PHP is enabled, but was compiled without support for functions used by the rotate and desaturate effects. It was probably compiled using the official GD libraries from http://www.libgd.org instead of the GD library bundled with PHP. You should recompile PHP --with-gd using the bundled GD library. See <a href="http://php.net/manual/book.image.php">the PHP manual</a>.');
$descriptions[]=$this->t('The GD Library for PHP is enabled, but was compiled without support for functions used by the rotate and desaturate effects. It was probably compiled using the official GD libraries from the <a href="https://libgd.github.io/">gdLibrary site</a> instead of the GD library bundled with PHP. You should recompile PHP --with-gd using the bundled GD library. See <a href="https://www.php.net/manual/book.image.php">the PHP manual</a>.');