use images from deeper directories for preview if the actual directory doesn't contain any

apps/gallery/templates/index.php

@@ -102,6 +102,8 @@ $previous_element = @$images[0];
 $root_images = array();
 $second_level_images = array();
 
+$fallback_images = array(); // if the folder only cotains subfolders with images -> these are taken for the stack preview
+
 for($i = 0; $i < count($images); $i++) {
         $prev_dir_arr = explode('/', $previous_element);
         $dir_arr = explode('/', $images[$i]);
@@ -109,12 +111,23 @@ for($i = 0; $i < count($images); $i++) {
         if(count($dir_arr) == 1) { // getting the images in this directory
                 $root_images[] = $root.$images[$i];
         } else {
-		if(strcmp($prev_dir_arr[0], $dir_arr[0]) != 0) {
+                if(strcmp($prev_dir_arr[0], $dir_arr[0]) != 0) { // if we entered a new directory
+                        if(count($second_level_images) == 0) { // if we don't have images in this directory
+                                if(count($fallback_images) != 0) { // but have fallback_images
+                                        $tl->addTile(new \OC\Pictures\TileStack($fallback_images, $prev_dir_arr[0]));
+                                        $fallback_images = array();
+                                }
+                        } else { // if we collected images for this directory
                                 $tl->addTile(new \OC\Pictures\TileStack($second_level_images, $prev_dir_arr[0]));
+                                echo print_r($fallback_images)."\n";
+                                $fallback_images = array();
                                 $second_level_images = array();
                         }
-		if (count($dir_arr) == 2) { // These are the pics in that subdir
+                }
+                if (count($dir_arr) == 2) { // These are the pics in our current subdir
                         $second_level_images[] = $root.$images[$i];
+                } else { // These are images from the deeper directories
+                        $fallback_images[] = $root.$images[$i];
                 }
                 // have us a little something to compare against
                 $previous_element = $images[$i];