Media: Restore the ability of `WP_Image_Editor_Imagick->save()` to create a missing directory when needed.

Props eemitch, mikeschroder, hellofromTonya, p00ya, johnbillion

Fixes #51665

Built from https://develop.svn.wordpress.org/trunk@49542


git-svn-id: http://core.svn.wordpress.org/trunk@49280 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-image-editor-imagick.php

@@ -741,6 +741,20 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
 				return true;
 			}
 		} else {
+			$dir_name   = dirname( $filename );
+			$dir_exists = wp_mkdir_p( $dir_name );
+
+			if ( ! $dir_exists ) {
+				return new WP_Error(
+					'image_save_error',
+					sprintf(
+						/* translators: %s: Directory path. */
+						__( 'Unable to create directory %s. Is its parent directory writable by the server?' ),
+						esc_html( $dir_name )
+					)
+				);
+			}
+
 			try {
 				return $image->writeImage( $filename );
 			} catch ( Exception $e ) {

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-beta3-49541';
+$wp_version = '5.6-beta3-49542';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.