[PATCH v2 2/2] win32u: Fix return value of ScrollWindowEx() for invisible windows.

[Dmitry Timoshkov]

From: Dmitry Timoshkov

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=37706
Signed-off-by: Dmitry Timoshkov 
---
 dlls/user32/tests/msg.c | 4 +---
 dlls/win32u/dce.c       | 7 +++++--
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/dlls/user32/tests/msg.c b/dlls/user32/tests/msg.c
index 5fa733be047..19d08196c1a 100644
--- a/dlls/user32/tests/msg.c
+++ b/dlls/user32/tests/msg.c
@@ -12992,15 +12992,13 @@ static void test_scrollwindowex(void)

ret = ScrollWindowEx(hwnd, 10, 10, &rect, NULL, NULL, NULL,
             SW_SCROLLCHILDREN|SW_ERASE|SW_INVALIDATE);
-    todo_wine
     ok(ret == NULLREGION, "got %d\n", ret);
-    ok_sequence(WmEmptySeq, "ScrollWindowEx", FALSE);
+    ok_sequence(WmEmptySeq, "ScrollWindowEx", TRUE);
     flush_events();
     flush_sequence();

ret = ScrollWindowEx(hwnd, 10, 10, NULL, NULL, NULL, NULL,
             SW_SCROLLCHILDREN|SW_ERASE|SW_INVALIDATE);
-    todo_wine
     ok(ret == NULLREGION, "got %d\n", ret);
     ok_sequence(ScrollWindowExSeq, "ScrollWindowEx", TRUE);
     flush_events();
diff --git a/dlls/win32u/dce.c b/dlls/win32u/dce.c
index 68de024c8b3..a26f5824738 100644
--- a/dlls/win32u/dce.c
+++ b/dlls/win32u/dce.c
@@ -2080,10 +2080,13 @@ INT WINAPI NtUserScrollWindowEx( HWND hwnd, INT dx, INT dy, const RECT *rect,
     rdw_flags = (flags & SW_ERASE) && (flags & SW_INVALIDATE) ?
         RDW_INVALIDATE | RDW_ERASE  : RDW_INVALIDATE;

-    if (!is_window_drawable( hwnd, TRUE )) return ERROR;
     hwnd = get_full_window_handle( hwnd );

-    get_client_rect( hwnd, &rc, get_thread_dpi() );
+    if (!is_window_drawable( hwnd, TRUE ))
+        SetRectEmpty( &rc );
+    else
+        get_client_rect( hwnd, &rc, get_thread_dpi() );
+
     if (clip_rect) intersect_rect( &cliprc, &rc, clip_rect );
     else cliprc = rc;