[PATCH v3 1/2] user32/tests: Test that ShowWindow(SW_SHOWMINIMIZED) shouldn't make a window visible.

[Zhiyi Zhang]

This bug can be triggered on Mutter because it unminimizes windows when handling map requests.

Also see https://gitlab.gnome.org/GNOME/mutter/-/blob/main/src/x11/events.c#L1525 for how map
requests are handled.

Signed-off-by: Zhiyi Zhang <zzhang at codeweavers.com>
---
v3: Supersede 227676~227677. Fix test failures.

 dlls/user32/tests/win.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/dlls/user32/tests/win.c b/dlls/user32/tests/win.c
index cfcec5cc78f..f47fcd2fe65 100644
--- a/dlls/user32/tests/win.c
+++ b/dlls/user32/tests/win.c
@@ -7420,7 +7420,9 @@ static void test_ShowWindow(void)
     RECT rcMain, rc, rcMinimized, rcClient, rcEmpty, rcMaximized, rcResized, rcNonClient, rcBroken;
     LPARAM ret;
     MONITORINFO mon_info;
-    unsigned int i;
+    unsigned int i, timeout = 0;
+    COLORREF color;
+    HDC hdc;
 
     DWORD test_style[] =
     {
@@ -7693,6 +7695,30 @@ static void test_ShowWindow(void)
 
     flush_events(TRUE);
 
+    /* Test SW_SHOWMINIMIZED shouldn't restore windows from minimized state */
+    SetWindowPos(hwndMain, 0, 100, 100, 0, 0, SWP_NOZORDER | SWP_NOSIZE);
+    hwnd = CreateWindowA("static", "test", WS_POPUP, 100, 100, 200, 200, NULL, NULL, NULL, NULL);
+    ok(hwnd != NULL, "CreateWindowA failed, error %d.\n", GetLastError());
+    ShowWindow(hwnd, SW_SHOWMINIMIZED);
+    flush_events(TRUE);
+
+    hdc = GetDC(0);
+    color = GetPixel(hdc, 150, 150);
+    /* Desktop pixels may take a while to update */
+    while (color != 0xffffff && timeout < 1000)
+    {
+        Sleep(100);
+        timeout += 100;
+        color = GetPixel(hdc, 150, 150);
+    }
+    /* The window rectangle of hwndMain is (100, 100, 300, 300). If the window manager unminimizes
+     * hwnd, hwnd will end up obscuring hwndMain. Mutter is such a window manager that unminimizes
+     * windows when handling map requests and thus can demonstrate this bug */
+    todo_wine_if(color != 0xffffff)
+    ok(color == 0xffffff, "Expected color %#x, got %#x.\n", 0xffffff, color);
+    ReleaseDC(0, hdc);
+    DestroyWindow(hwnd);
+
     /* test maximize and restore windows without setting WS_CAPTION */
 
     for (i = 0; i < ARRAY_SIZE(test_style); ++i)
-- 
2.32.0