[PATCH 0/2] MR7142: win32u: Reset surface clip region if it matches the visible rect.

[Rémi Bernon (＠rbernon)]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57665

With an empty clipping region, when the window is being shown, the Expose event we receive is ignored by `expose_window_surface`, assuming there's no redraw necessary. If a clipping region is set, we call `NtUserRedrawWindow` with `RDW_ERASE` which clears the window.

[PATCH 1/2] win32u: Always return the visible rect from get_window_region.

[Rémi Bernon]

From: Rémi Bernon

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57665
---
 dlls/win32u/window.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c
index ba204957669..3711c76f5a6 100644
--- a/dlls/win32u/window.c
+++ b/dlls/win32u/window.c
@@ -1817,6 +1817,7 @@ static NTSTATUS get_window_region( HWND hwnd, BOOL surface, HRGN *region, RECT *
             if (!(status = wine_server_call( req )))
             {
                 size_t reply_size = wine_server_reply_size( reply );
+                *visible = wine_server_get_rect( reply->visible_rect );
                 if (reply_size)
                 {
                     data->rdh.dwSize   = sizeof(data->rdh);
@@ -1824,7 +1825,6 @@ static NTSTATUS get_window_region( HWND hwnd, BOOL surface, HRGN *region, RECT *
                     data->rdh.nCount   = reply_size / sizeof(RECT);
                     data->rdh.nRgnSize = reply_size;
                     *region = NtGdiExtCreateRegion( NULL, data->rdh.dwSize + data->rdh.nRgnSize, data );
-                    *visible = wine_server_get_rect( reply->visible_rect );
                 }
             }
             else size = reply->total_size;

[PATCH 2/2] win32u: Reset surface clip region if it matches the visible rect.

[Rémi Bernon]

From: Rémi Bernon

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57665
---
 dlls/win32u/window.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c
index 3711c76f5a6..bf7c01385bd 100644
--- a/dlls/win32u/window.c
+++ b/dlls/win32u/window.c
@@ -1818,6 +1818,10 @@ static NTSTATUS get_window_region( HWND hwnd, BOOL surface, HRGN *region, RECT *
             {
                 size_t reply_size = wine_server_reply_size( reply );
                 *visible = wine_server_get_rect( reply->visible_rect );
+
+                /* if the clipping region is requested, return an empty region if it already matches the visible rect */
+                if (surface && reply_size == sizeof(*visible) && EqualRect( visible, (RECT *)data->Buffer )) reply_size = 0;
+
                 if (reply_size)
                 {
                     data->rdh.dwSize   = sizeof(data->rdh);