Parity - Creative inventory search box is not automatically focused when opening the Search tab

In Java Edition, opening the Search tab in the Creative inventory automatically focuses the search box, so the player can start typing immediately. The search box also remains automatically focused when switching between Creative inventory tabs or after closing and reopening the inventory.

In Bedrock Edition, the search box doesn't automatically focus. The player must first click the search box before typing.

Steps to reproduce

1. Open a world in Creative mode.

2. Open the Creative inventory.

3. Select the Search tab.

4. Without clicking anywhere else, begin typing.

Expected result

The search box should automatically focus when the Search tab is opened, matching Java Edition and allowing the player to begin typing immediately.

Actual result

The search box is not focused when you open the Search tab. The player must click inside the search box before typing.