CandySpawner: Scale down oversize candies

It might be that a learner will drop any old image into the Image/Candy
directory of their world.

Handle this case by scaling down any image that is larger than the
default image so that its longest axis is the same size as the default.

Script/CandySpawner.gd

@@ -16,6 +16,7 @@ extends Node2D
 var _texture_index := 0
 
 const FALLBACK_TEXTURE : Texture2D = preload("res://Image/Candy.png")
+var _MAX_SIZE = FALLBACK_TEXTURE.get_size().x
 
 var delay := 3.0
 var timer := 0.0
@@ -47,6 +48,18 @@ func _ready() -> void:
 	candy_textures.shuffle()
 
 
+func _make_sprite() -> Sprite2D:
+	var c := Sprite2D.new()
+	c.texture = candy_textures[_texture_index]
+	var dimensions = c.texture.get_size()
+	if dimensions.x > _MAX_SIZE or dimensions.y > _MAX_SIZE:
+		c.scale *= (_MAX_SIZE / max(dimensions.x, dimensions.y))
+	_texture_index += 1
+	_texture_index %= candy_textures.size()
+	add_child(c)
+	return c
+
+
 func _process(delta):
 	timer -= delta
 
@@ -64,11 +77,7 @@ func _process(delta):
 		if idle.size() > 0:
 			c = idle.pop_back()
 		else:
-			c = Sprite2D.new()
-			c.texture = candy_textures[_texture_index]
-			_texture_index += 1
-			_texture_index %= candy_textures.size()
-			add_child(c)
+			c = _make_sprite()
 		active.append(c)
 		c.position.y = -16
 		c.position.x = randi_range(0, 144)