Zhiyi Zhang : user32: Report a fake monitor when running on an invisible window station.

[Alexandre Julliard]

Module: wine
Branch: oldstable
Commit: 493a7f4daad1692637681ef711a33e29246dfd08
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=493a7f4daad1692637681ef71...

Author: Zhiyi Zhang 
Date:   Tue Aug 17 16:29:59 2021 +0800

user32: Report a fake monitor when running on an invisible window station.

The visible window station check was accidentally deleted in 95be042.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51590
Signed-off-by: Zhiyi Zhang 
Signed-off-by: Alexandre Julliard 
(cherry picked from commit f8ce819ab57b42329b52d18fa29e5a79cfd1abf6)
Signed-off-by: Michael Stefaniuc

---

dlls/user32/sysparams.c     | 10 +++++++++-
 dlls/user32/tests/monitor.c |  7 +++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/dlls/user32/sysparams.c b/dlls/user32/sysparams.c
index 55d6d7e53a7..8b45704a9f8 100644
--- a/dlls/user32/sysparams.c
+++ b/dlls/user32/sysparams.c
@@ -4006,12 +4006,20 @@ static BOOL CALLBACK enum_mon_callback( HMONITOR monitor, HDC hdc, LPRECT rect,

BOOL CDECL nulldrv_EnumDisplayMonitors( HDC hdc, RECT *rect, MONITORENUMPROC proc, LPARAM lp )
 {
+    BOOL is_winstation_visible = FALSE;
+    USEROBJECTFLAGS flags;
+    HWINSTA winstation;
     RECT monitor_rect;
     DWORD i = 0;

TRACE("(%p, %p, %p, 0x%lx)\n", hdc, rect, proc, lp);

-    if (update_monitor_cache())
+    /* Report physical monitor information only if window station has visible display surfaces */
+    winstation = GetProcessWindowStation();
+    if (GetUserObjectInformationW( winstation, UOI_FLAGS, &flags, sizeof(flags), NULL ))
+        is_winstation_visible = flags.dwFlags & WSF_VISIBLE;
+
+    if (is_winstation_visible && update_monitor_cache())
     {
         while (TRUE)
         {
diff --git a/dlls/user32/tests/monitor.c b/dlls/user32/tests/monitor.c
index a587c7c6b16..a5be9021cbc 100644
--- a/dlls/user32/tests/monitor.c
+++ b/dlls/user32/tests/monitor.c
@@ -1560,6 +1560,7 @@ static void test_EnumDisplayMonitors(void)
     static const DWORD DESKTOP_ALL_ACCESS = 0x01ff;
     HWINSTA winstation, old_winstation;
     HDESK desktop, old_desktop;
+    USEROBJECTFLAGS flags;
     INT count, old_count;
     DWORD error;
     BOOL ret;
@@ -1599,6 +1600,12 @@ static void test_EnumDisplayMonitors(void)
     ok(ret, "SetProcessWindowStation failed, error %#x.\n", GetLastError());
     ok(winstation == GetProcessWindowStation(), "Expected %p, got %p.\n", GetProcessWindowStation(), winstation);

+    flags.fInherit = FALSE;
+    flags.fReserved = FALSE;
+    flags.dwFlags = WSF_VISIBLE;
+    ret = SetUserObjectInformationW(winstation, UOI_FLAGS, &flags, sizeof(flags));
+    ok(ret, "SetUserObjectInformationW failed, error %#x.\n", GetLastError());
+
     desktop = CreateDesktopW(L"test_desktop", NULL, NULL, 0, DESKTOP_ALL_ACCESS, NULL);
     ok(!!desktop && desktop != old_desktop, "CreateDesktopW failed, error %#x.\n", GetLastError());
     ret = SetThreadDesktop(desktop);