CharacterSpriteBehavior: Reset frames when back to idle

The townies "idle" has a subtle up and down animation.

For a character made of parts, since the last commit one part (like the head)
may keep playing "idle" while another (like the legs) may play "walk". But when
the character is back to idle, all parts should be set in sync again. Otherwise,
the head may go up when the legs go down, making a funny but not desired (for
now) dance.

Author: manuq

scenes/game_logic/sprite_behaviors/character_sprite_behavior.gd

@@ -19,6 +19,7 @@ extends BaseSpriteBehavior
 ## Use this when using more advanced animation through an AnimationPlayer node.
 @export var play_animations: bool = true
 
+var _previous_character_velocity: Vector2
 var _is_character_running: bool = false
 
 
@@ -48,7 +49,9 @@ func _process(delta: float) -> void:
 func _process_animations(_delta: float) -> void:
 	if character.velocity.is_zero_approx():
 		sprite.speed_scale = 1.0
-		sprite.play(&"idle")
+		if not _previous_character_velocity.is_zero_approx():
+			sprite.play(&"idle")
+			sprite.set_frame_and_progress(0, 0.0)
 	else:
 		if _is_character_running:
 			if sprite.sprite_frames.has_animation(&"run"):
@@ -60,6 +63,7 @@ func _process_animations(_delta: float) -> void:
 		else:
 			sprite.speed_scale = 1.0
 			sprite.play(&"walk" if sprite.sprite_frames.has_animation(&"walk") else &"idle")
+	_previous_character_velocity = character.velocity
 
 
 func _notification(what: int) -> void: