Fixed compatibility issues when dragging the TabBar in Godot 4.6.

[Yanxiyimengya]

Fixed #39

The built-in TabBar component in Godot 4.6 hardcodes drag_data["type"] = "tab" in the C source code.

The old code strictly matches tab_container_tab or tabc_element, causing the _can_handle_drag_data function to return false directly, which blocks all drag-and-drop signals.

It's necessary to relax the type check and add compatibility for the tab_index key, which still works well in the editor from versions 4.4 to 4.6.

[gilzoide]

Hey @Yanxiyimengya, thanks for creating separate PRs for the fixes!

The changes looks good to me (although I still have to test). I let the CI run, gdformat is saying that the code format does not conform to GDScript standard, could you please reformat the code using it to maintain consistency?

[Yanxiyimengya]

Hey @Yanxiyimengya, thanks for creating separate PRs for the fixes!

The changes looks good to me (although I still have to test). I let the CI run, gdformat is saying that the code format does not conform to GDScript standard, could you please reformat the code using it to maintain consistency?

Thank you for your reply. I have finished formatting the code and merged all the commits.

[gilzoide]

Awesome, thanks a lot for the contribution!
Cheers \o/