Removing a custom data layer does not update custom data name-to-layer mappings.

[wickworks]

Godot version

v4.0.3.stable.mono.official [5222a99]

System information

macOS Monterey 12.6.6 (21G646)

Issue description

When creating a tileset by code with custom data layers, removing a layer with remove_custom_data_layer does not update the name-to-layer mapping; get_custom_data_layer_by_name will continue to return that layer's original index.

This has a downstream effect of causing TileData objects attempting to use get_custom_data('Layer B') to return invalid data (whatever custom data is now in Layer B's old index; e.g. Layer C).

I would expect that after using remove_custom_data_layer, I would be able to still use get_custom_data_layer_by_name on that tileset.

Steps to reproduce

Run this code to see that getting Layer B by name after removing the first layer continues to return its original index (1) when in reality it is now at index 0.

	var tileset:TileSet = TileSet.new()

	tileset.add_custom_data_layer()
	tileset.set_custom_data_layer_name(0, 'Layer A')
	tileset.set_custom_data_layer_type(0, TYPE_INT)

	tileset.add_custom_data_layer()
	tileset.set_custom_data_layer_name(1, 'Layer B')
	tileset.set_custom_data_layer_type(1, TYPE_STRING)

	print('Layer index 0 name : ', tileset.get_custom_data_layer_name(0)) # Layer A
	print('Layer index 1 name : ', tileset.get_custom_data_layer_name(1)) # Layer B
	print('Layer B is on index : ', tileset.get_custom_data_layer_by_name("Layer B")) # 1

	print('----- removing custom data layer 0 -----')
	tileset.remove_custom_data_layer(0)

	print('Layer index 0 name : ', tileset.get_custom_data_layer_name(0)) # Layer B
	print('Layer index 1 name : ', tileset.get_custom_data_layer_name(1)) # prints an error, as expected
	print('Layer B is on index : ', tileset.get_custom_data_layer_by_name("Layer B")) # returns 1 still! should return 0.

Minimal reproduction project

RemoveCustomDataLayer.zip