Dmitry Timoshkov : user32/tests: Add a test to show that SendMessage(LB_SETCOUNT) adds a scrollbar.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 7103be9c1b6cb21b074d7710f7316433ae46444b
URL:    https://gitlab.winehq.org/wine/wine/-/commit/7103be9c1b6cb21b074d7710f731643...

Author: Dmitry Timoshkov 
Date:   Tue May 28 18:39:28 2024 +0300

user32/tests: Add a test to show that SendMessage(LB_SETCOUNT) adds a scrollbar.

In addition to existing tests this shows that the call
SendMessage(listbox, LB_SETCOUNT, 100, 0);
adds a scrollbar to the listbox however it doesn't add a nonclient area to
an update region because the call
ValidateRect(listbox, NULL);
validates a client area, and after that a window no longer has an update region.

Signed-off-by: Dmitry Timoshkov

---

dlls/user32/tests/listbox.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dlls/user32/tests/listbox.c b/dlls/user32/tests/listbox.c
index c78171ff4d8..747e3dae192 100644
--- a/dlls/user32/tests/listbox.c
+++ b/dlls/user32/tests/listbox.c
@@ -1939,11 +1939,17 @@ static void test_set_count( void )
     GetUpdateRect( listbox, &r, TRUE );
     ok( IsRectEmpty( &r ), "got non-empty rect\n");

+    ret = GetWindowLongA( listbox, GWL_STYLE );
+    ok((ret & (WS_VSCROLL | WS_HSCROLL)) == 0, "Listbox should not have scroll bars\n");
+
     ret = SendMessageA( listbox, LB_SETCOUNT, 100, 0 );
     ok( ret == 0, "got %ld\n", ret );
     ret = SendMessageA( listbox, LB_GETCOUNT, 0, 0 );
     ok( ret == 100, "got %ld\n", ret );

+    ret = GetWindowLongA( listbox, GWL_STYLE );
+    ok((ret & (WS_VSCROLL | WS_HSCROLL)) == WS_VSCROLL, "Listbox should have vertical scroll bar\n");
+
     GetUpdateRect( listbox, &r, TRUE );
     ok( !IsRectEmpty( &r ), "got empty rect\n");