Fix thumbnail disappears if FileSystemDock is floated

editor/filesystem_dock.cpp

@@ -765,7 +765,7 @@ void FileSystemDock::navigate_to_path(const String &p_path) {
 }
 
 void FileSystemDock::_file_list_thumbnail_done(const String &p_path, const Ref<Texture2D> &p_preview, const Ref<Texture2D> &p_small_preview, const Variant &p_udata) {
-	if ((file_list_vb->is_visible_in_tree() || current_path == p_path.get_base_dir()) && p_preview.is_valid()) {
+	if ((file_list_vb->is_visible_in_tree() || current_path.trim_suffix("/") == p_path.get_base_dir()) && p_preview.is_valid()) {
 		Array uarr = p_udata;
 		int idx = uarr[0];
 		String file = uarr[1];