From fe00a2928c5f490be2d8f70a03af5529dfbaad7f Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Fri, 11 Mar 2022 19:11:35 +0000
Subject: [PATCH] Windows: diagnose failure to create the terminal window.

It only fails in very unusual circumstances, but that's all the more
reason to give a useful report when it does!
---
 windows/window.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/windows/window.c b/windows/window.c
index c1cd0c4c..39a7ca34 100644
--- a/windows/window.c
+++ b/windows/window.c
@@ -575,6 +575,10 @@ int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show)
         wgs.term_hwnd = CreateWindowExW(
             exwinmode, uappname, uappname, winmode, CW_USEDEFAULT,
             CW_USEDEFAULT, guess_width, guess_height, NULL, NULL, inst, NULL);
+        if (!wgs.term_hwnd) {
+            modalfatalbox("Unable to create terminal window: %s",
+                          win_strerror(GetLastError()));
+        }
         memset(&dpi_info, 0, sizeof(struct _dpi_info));
         init_dpi_info();
         sfree(uappname);