Jinoh Kang : win32u: Honor CS_HREDRAW and CS_VREDRAW when resizing window.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: eb1f9896cc023786e5d1a1d0e7e9ea434a9d7cae
URL:    https://gitlab.winehq.org/wine/wine/-/commit/eb1f9896cc023786e5d1a1d0e7e9ea4...

Author: Jinoh Kang <jinoh.kang.kr(a)gmail.com>
Date:   Thu Dec 22 01:21:48 2022 +0900

win32u: Honor CS_HREDRAW and CS_VREDRAW when resizing window.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52903

---

 dlls/user32/tests/msg.c | 1 -
 dlls/win32u/window.c    | 7 ++++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/dlls/user32/tests/msg.c b/dlls/user32/tests/msg.c
index 461d79d9a5d..35e4f0dd1f8 100644
--- a/dlls/user32/tests/msg.c
+++ b/dlls/user32/tests/msg.c
@@ -9475,7 +9475,6 @@ static void subtest_hvredraw(HWND hparent, const char *classname, DWORD style)
         CombineRgn( hrgn_expect, hrgn_new_vis, hrgn_old_vis, is_redraw ? RGN_COPY : RGN_DIFF );
 
         rgn_ok = EqualRgn( hrgn_expect, hrgn_actual );
-        todo_wine_if( is_redraw )
         ok( !!rgn_ok, "Update region shall match expected region\n" );
 
         if (!rgn_ok && winetest_debug > 1)
diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c
index 19348338c46..a3ff0647dcd 100644
--- a/dlls/win32u/window.c
+++ b/dlls/win32u/window.c
@@ -3116,6 +3116,7 @@ static UINT calc_ncsize( WINDOWPOS *winpos, const RECT *old_window_rect, const R
     {
         NCCALCSIZE_PARAMS params;
         WINDOWPOS winposCopy;
+        UINT class_style;
 
         params.rgrc[0] = *new_window_rect;
         params.rgrc[1] = *old_window_rect;
@@ -3135,7 +3136,11 @@ static UINT calc_ncsize( WINDOWPOS *winpos, const RECT *old_window_rect, const R
             winposCopy.cy = old_window_rect->bottom - old_window_rect->top;
         }
 
-        wvr_flags = send_message( winpos->hwnd, WM_NCCALCSIZE, TRUE, (LPARAM)¶ms );
+        class_style = get_class_long( winpos->hwnd, GCL_STYLE, FALSE );
+        if (class_style & CS_VREDRAW) wvr_flags |= WVR_VREDRAW;
+        if (class_style & CS_HREDRAW) wvr_flags |= WVR_HREDRAW;
+
+        wvr_flags |= send_message( winpos->hwnd, WM_NCCALCSIZE, TRUE, (LPARAM)¶ms );
 
         *new_client_rect = params.rgrc[0];