xpackal5

Hi i update ublaboo/datagrid and have different problem. Datasource of grid js QueryBuilder but getChildrenCallback returns Collection of children entities and hasChildrenCallback returns true/false if entity has children or not....

PHP 7.3.. require part of my composer.json ``` "squizlabs/php_codesniffer": "^3.4", "jakub-onderka/php-parallel-lint": "^1.0", "jakub-onderka/php-console-highlighter": "^0.4.0", "nette/application": "^3.0", "tracy/tracy": "2.5.8", "nette/di": "^3.0", "nette/tester": "^2.3", "nette/forms": "^3.0", "nette/mail": "^3.1", "nette/neon": "^3.0", "nette/security": "^3.0",...

I found that $datagrid->redrawItem($id) does not work correctly (redraw only one row and other rows disappeared)