Add an optional extra RESET step in Tween demo (#892)

2d/tween/main.gd

@@ -121,10 +121,15 @@ func start_animation():
 		tween.tween_callback(icon.show)
 		tween.tween_callback(icon.set_self_modulate.bind(Color.WHITE))
 
+	# RESET step
+
+	if %Reset.button_pressed:
+		tween.tween_callback(reset.bind(true))
+
 func do_countdown(v):
 	countdown_label.text = str(v)
 
-func reset():
+func reset(soft := false):
 	icon.position = icon_start_position
 	icon.self_modulate = Color.WHITE
 	icon.rotation = 0
@@ -132,6 +137,10 @@ func reset():
 	icon.show()
 	countdown_label.hide()
 
+	if soft:
+		# Only reset properties.
+		return
+
 	if tween:
 		tween.kill()
 		tween = null

2d/tween/main.tscn

@@ -68,6 +68,14 @@ unique_name_in_owner = true
 layout_mode = 2
 text = "Infinite?"
 
+[node name="Reset" type="CheckBox" parent="VBoxContainer/PanelContainer/VBoxContainer/HBoxContainer3"]
+unique_name_in_owner = true
+layout_mode = 2
+tooltip_text = "If enabled, the Tween will take an extra step to ensure
+that all properties are restored to their initial value."
+button_pressed = true
+text = "Reset Between Loops?"
+
 [node name="Button" type="Button" parent="VBoxContainer/PanelContainer/VBoxContainer/HBoxContainer3"]
 layout_mode = 2
 text = "Start Animation"