From ef742b85f2873ef327903748cf7027685860494f Mon Sep 17 00:00:00 2001
From: jiepengtan <jiepengtan@gmail.com>
Date: Mon, 27 May 2024 15:42:00 +0800
Subject: [PATCH] Update window size immediately when backdrop changes

---
 game.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/game.go b/game.go
index d71729fc..1e50e6c0 100644
--- a/game.go
+++ b/game.go
@@ -1082,7 +1082,8 @@ func (p *Game) BackdropIndex() int {
 //	StartBackdrop(spx.Prev)
 func (p *Game) StartBackdrop(backdrop interface{}, wait ...bool) {
 	if p.goSetCostume(backdrop) {
-		p.windowWidth_ = 0 // TODO: need review
+		p.windowWidth_ = 0
+		p.doWindowSize()
 		p.doWhenBackdropChanged(p.getCostumeName(), wait != nil && wait[0])
 	}
 }