From f4df788d114a8c651c568214bf458b81404e7621 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juhani=20Krekel=C3=A4?= <juhani@krekelä.fi>
Date: Thu, 23 Mar 2023 12:28:42 +0200
Subject: [PATCH] Reduce flickering while moving windows

---
 shell.asm | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/shell.asm b/shell.asm
index ec413bc..76f6b22 100644
--- a/shell.asm
+++ b/shell.asm
@@ -297,16 +297,24 @@ resize:
 ;  si = pointer to window structure
 move:
 	push dx
-	mov [si + window.y], bx
 
-	mov [si + window.x], cx
-	mov dx, [si + window.res_x]
-	sub [si + window.x], dx
+	mov dx, cx
+	sub dx, [si + window.res_x]
 
-	.not_underflow:
+	cmp [si + window.y], bx
+	jne .change
+	cmp [si + window.x], dx
+	jne .change
+	jmp .end
+
+	.change
+		mov [si + window.y], bx
+		mov [si + window.x], dx
+
+		call request_redraw
+
+	.end:
 	pop dx
-
-	call request_redraw
 	ret
 
 ; in: