# HG changeset patch
# User bsmith@81767d24-ef19-dc11-ae90-00e081727c95
# Date 1303511180 0
# Node ID 24b19b905f0481c6d845fb11e5a3be40104cc744
# Parent  8a8d2699bd090a78af97944d39dd2bd312286fa4
Add the WS_EX_COMPOSITED window flag to toplevel windows on Windows XP or higher to enable double buffering for flicker free redrawing.

diff -r 8a8d2699bd09 -r 24b19b905f04 win/dw.c
--- a/win/dw.c	Fri Apr 22 13:21:48 2011 +0000
+++ b/win/dw.c	Fri Apr 22 22:26:20 2011 +0000
@@ -4457,7 +4457,7 @@
 {
    HWND hwndframe;
    Box *newbox = calloc(sizeof(Box), 1);
-   ULONG flStyleEx = 0;
+   ULONG flStyleEx = IS_XPPLUS ? WS_EX_COMPOSITED : 0;
 
    newbox->pad = 0;
    newbox->type = DW_VERT;