From c1a809c567a3f64c478c8e6c495552357864b1c2 Mon Sep 17 00:00:00 2001
From: alex <alex@cloudware.io>
Date: Mon, 7 Aug 2023 14:19:38 +0200
Subject: [PATCH] ui/lvgl: fix a bug where a top container didn't have its
 object created

a previous commit 7d1ab5cb rewrote toplayer objects creation as
Container.newTop except the new code was using the top layer object
obtained from lv_disp_get_layer_top as is. this obviously led to all
sorts of UB and illegal memory access when screen.sleep'ing.
---
 src/ui/lvgl.zig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/ui/lvgl.zig b/src/ui/lvgl.zig
index 9fcd2dd..da441ad 100644
--- a/src/ui/lvgl.zig
+++ b/src/ui/lvgl.zig
@@ -482,7 +482,8 @@ pub const Container = struct {
     /// suitable for widgets like a popup window.
     pub fn newTop() !Container {
         const toplayer = lv_disp_get_layer_top(null);
-        return .{ .lvobj = toplayer };
+        const o = lv_obj_create(toplayer) orelse return error.OutOfMemory;
+        return .{ .lvobj = o };
     }
 
     /// applies flex layout to the container.