### Godot version

v4.2.dev3.official [013e8e3af]

### System information

Windows 11, Core i5-12400F, RX 6600

### Issue description

TileSet->Setup->Separation maybe should have "px" like rest?
![Screenshot 2023-08-21 162202](https://github.com/godotengine/godot/assets/962340/3c6b9a97-7520-4610-8153-7882cc9c303f)
I know this is pixels from testing it.

TileSet->Select is this Animation Separation "px" too? idk
![Screenshot 2023-08-21 162131](https://github.com/godotengine/godot/assets/962340/fcb580e3-9ff7-41d8-92d3-e585841d3803)
I tried setting up animation separation and got a not enough room error, so maybe not "px". idk


Thanks.


### Steps to reproduce

- open TileSet->Setup->Separation, note some have "px" and one doesn't
- open TileSet->Select, is this separation "px" too?


### Minimal reproduction project

n/a
}
			}
			undo_redo->add_undo_method(this, "_set_selection_from_array", _get_selection_as_array());
			undo_redo->commit_action();
		} break;
		case DRAG_TYPE_MOVE_TILE:
			if (drag_current_tile != drag_start_tile_shape.position) {
				undo_redo->create_action(TTR("Move a tile"));
				undo_redo->add_do_method(tile_set_atlas_source, "move_tile_in_atlas", drag_start_tile_shape.position, drag_current_tile, tile_set_atlas_source->get_tile_size_in_atlas(drag_current_tile));
				undo_redo->add_do_method(this, "_set_selection_from_array", _get_selection_as_array());
				undo_redo->add_undo_method(tile_set_atlas_source, "move_tile_in_atlas", drag_current_tile, drag_start_tile_shape.position, drag_start_tile_shape.size);
				Array array;
				array.push_back(drag_start_tile_shape.position);
				array.push_back(0);
				undo_redo->add_undo_method(this, "_set_selection_from_array", array);
				undo_redo->commit_action(false);
			}
			break;
		case DRAG_TYPE_RECT_SELECT: {
			Vector2i start_base_tiles_coords = tile_atlas_view->get_atlas_tile_coords_at_pos(drag_start_mouse_pos, true);
			Vector2i new_base_tiles_coords = tile_atlas_view->get_atlas_tile_coords_at_pos(tile_atlas_control->get_local_mouse_position(), true);
			ERR_FAIL_COND(start_base_tiles_coords == TileSetSource::INVALID_ATLAS_COORDS);
			ERR_FAIL_COND(new_base_tiles_coords == TileSetSource::INVALID_ATLAS_COORDS);
			Rect2i region = Rect2i(start_base_tiles_coords, new_base_tiles_coords - start_base_tiles_coords).abs();
			region.size += Vector2i(1, 1);
			undo_redo->create_action(TTR("Select tiles"));
			undo_redo->add_undo_method(this, "_set_selection_from_array", _get_selection_as_array());
			
			bool add_to_selection = true;
			if (Input::get_singleton()->is_key_pressed(Key::SHIFT)) {