From 179ddba93a0c1ab2aed0825d2ecc27b291099723 Mon Sep 17 00:00:00 2001
From: Pietro Gagliardi <pietro10@mac.com>
Date: Fri, 11 Apr 2014 11:32:27 -0400
Subject: [PATCH] Added CS_HREDRAW and CS_VREDRAW to our Area on Windows, just
 to be safe.

---
 area_windows.go | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/area_windows.go b/area_windows.go
index c8d201f..f29c3a7 100644
--- a/area_windows.go
+++ b/area_windows.go
@@ -595,8 +595,11 @@ func areaWndProc(s *sysData) func(hwnd _HWND, uMsg uint32, wParam _WPARAM, lPara
 
 func registerAreaWndClass(s *sysData) (newClassName string, err error) {
 	const (
+		_CS_HREDRAW = 0x0002
+		_CS_VREDRAW = 0x0001
+
 		// from winuser.h
-		_CS_DBLCLKS = 0x0008
+		_CS_DBLCLKS = 0x0008		// needed to be able to register double-clicks
 	)
 
 	areaWndClassNumLock.Lock()
@@ -605,7 +608,7 @@ func registerAreaWndClass(s *sysData) (newClassName string, err error) {
 	areaWndClassNumLock.Unlock()
 
 	wc := &_WNDCLASS{
-		style:			_CS_DBLCLKS,		// needed to be able to register double-clicks
+		style:			_CS_DBLCLKS | _CS_HREDRAW | _CS_VREDRAW,
 		lpszClassName:	uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(newClassName))),
 		lpfnWndProc:		syscall.NewCallback(areaWndProc(s)),
 		hInstance:		hInstance,