game/scripts/main.gd

@@ -111,8 +111,7 @@ func _ready() -> void:
 	showcase = Showcase.new()
 	showcase.art = art
 	showcase.closed.connect(close_showcase)
-	showcase.hide()
+	_hide_showcase()
-	showcase.process_mode = Node.PROCESS_MODE_DISABLED
 	add_child(showcase)
 	_show_menu("")
 	match options.start:
@@ -216,6 +215,7 @@ func _show_menu(status: String) -> void:
 ## Shows the world of the session and puts the figure on the spawn.
 func _show_world() -> void:
 	menu.hide()
+	_hide_showcase()
 	hud.show()
 	for node: Node2D in [avatar, marker, figures]:
 		node.show()
@@ -242,9 +242,15 @@ func open_showcase() -> void:
 
 ## Goes back from the style samples to the menu.
 func close_showcase() -> void:
+	_hide_showcase()
+	menu.show()
+
+
+## Hides the style samples and stops them. A world that starts while they are
+## open, such as the one a joining guest receives, takes their place.
+func _hide_showcase() -> void:
 	showcase.hide()
 	showcase.process_mode = Node.PROCESS_MODE_DISABLED
-	menu.show()
 
 
 ## Draws the playing field again after the style changed.

game/tests/test_main.gd

@@ -440,3 +440,15 @@ func test_the_style_samples_open_from_the_menu_and_lead_back_to_it() -> void:
 	check(main.menu.visible, "the menu is back")
 	check(not main.showcase.visible, "the samples are gone")
 	_clean_up([directory])
+
+
+func test_a_world_that_starts_takes_the_place_of_the_style_samples() -> void:
+	var directory := TestFiles.temporary_dir("samples-world")
+	var main := _start_main(directory)
+	main.open_showcase()
+	check(main.showcase.visible, "the samples are open")
+	main.play(false)
+	check(not main.showcase.visible, "the world shows instead of the samples")
+	check_eq(main.showcase.process_mode, Node.PROCESS_MODE_DISABLED, "and the samples take no input")
+	check(not main.menu.visible, "the menu stays hidden")
+	_clean_up([directory])