fixes MrEliptik#25 by moving the qr code creation to the button

scenes/app/scripts/app.gd

@@ -24,8 +24,6 @@ var curr_game_btn: Button = null
 @onready var update_checker := UpdateChecker.new()
 @onready var global_shortcut: GlobalShortcut 
 
-var qr_generator: QrCode = null
-
 var relaunch_on_crash: bool = false:
 	set(value):
 		relaunch_on_crash = value
@@ -54,10 +52,6 @@ func _ready() -> void:
 
 	SignalBus.shortcut_close_game_pressed.connect(func(): stop_game(pid_watching))
 
-	#configure QR generator
-	qr_generator = QrCode.new()
-	qr_generator.error_correct_level = QrCode.ErrorCorrectionLevel.LOW
-
 	if games.is_empty():
 		no_game_found.visible = true
 
@@ -263,13 +257,8 @@ func on_game_btn_focused(who: Button) -> void:
 		not_playable.visible = not playable
 		description.text += who.properties["description"]
 
-	# Also works in .ini has no "qr_url" property
-	var qr_url: String = who.properties.get("qr_url") if who.properties.get("qr_url") else ""
-	if not qr_url.is_empty():
-		var time_before: float = Time.get_ticks_usec()
-		var texture: ImageTexture = qr_generator.get_texture(qr_url)
-		print("QR gen (ms): ", (Time.get_ticks_usec() - time_before)/1000.0) 
-		qr_rect.texture = texture
+	if who.qr_texture != null:
+		qr_rect.texture = who.qr_texture
 		qr_container.visible = true
 		qr_label.text = who.properties["qr_label"]
 	else:

scenes/game_button/scripts/game_button.gd

@@ -5,6 +5,7 @@ signal focused(who: Button)
 var game_name: String 
 var properties: Dictionary
 var tween: Tween
+var qr_texture: ImageTexture = null
 
 @onready var capsule: TextureRect = $Capsule
 @onready var cross = $Cross
@@ -13,7 +14,12 @@ var tween: Tween
 @onready var platform: Label = $InfoContainer/PlatformContainer/Platform
 @onready var player_nb: Label = $InfoContainer/PlayerContainer/PlayerNb
 
+@onready var qr_generator = QrCode.new()
+
 func _ready() -> void:
+	#configure QR generator
+	qr_generator.error_correct_level = QrCode.ErrorCorrectionLevel.LOW
+
 	pivot_offset = size / 2.0
 
 	cross.visible = false
@@ -37,6 +43,13 @@ func _ready() -> void:
 
 	if properties.has("players_nb"):
 		player_nb.text = properties["players_nb"]
+
+	# Also works in .ini has no "qr_url" property
+	var qr_url: String = properties.get("qr_url") if properties.get("qr_url") else ""
+	if not qr_url.is_empty():
+		var time_before: float = Time.get_ticks_usec()
+		qr_texture = qr_generator.get_texture(qr_url)
+		print("QR gen (ms): ", (Time.get_ticks_usec() - time_before)/1000.0) 
 
 func load_image_texture(path: String) -> ImageTexture:
 	var capsule_im: Image = Image.new()