comctl32/button: Improve button data layout compatibility.

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/comctl32/button.c

@@ -90,6 +90,7 @@ WINE_DEFAULT_DEBUG_CHANNEL(button);
 typedef struct _BUTTON_INFO
 {
     HWND        hwnd;
+    HWND        parent;
     LONG        state;
     HFONT       font;
     WCHAR      *note;
@@ -342,6 +343,7 @@ static LRESULT CALLBACK BUTTON_WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, L
         infoPtr = heap_alloc_zero( sizeof(*infoPtr) );
         SetWindowLongPtrW( hWnd, 0, (LONG_PTR)infoPtr );
         infoPtr->hwnd = hWnd;
+        infoPtr->parent = GetParent(hWnd);
         return DefWindowProcW(hWnd, uMsg, wParam, lParam);
 
     case WM_NCDESTROY:

dlls/comctl32/tests/button.c

@@ -979,6 +979,62 @@ static void register_parent_class(void)
     RegisterClassA(&cls);
 }
 
+static void test_button_data(void)
+{
+    static const DWORD styles[] =
+    {
+        BS_PUSHBUTTON,
+        BS_DEFPUSHBUTTON,
+        BS_CHECKBOX,
+        BS_AUTOCHECKBOX,
+        BS_RADIOBUTTON,
+        BS_3STATE,
+        BS_AUTO3STATE,
+        BS_GROUPBOX,
+        BS_USERBUTTON,
+        BS_AUTORADIOBUTTON,
+        BS_OWNERDRAW,
+        BS_SPLITBUTTON,
+        BS_DEFSPLITBUTTON,
+        BS_COMMANDLINK,
+        BS_DEFCOMMANDLINK,
+    };
+
+    struct button_desc
+    {
+        HWND self;
+        HWND parent;
+    };
+    unsigned int i;
+    HWND parent;
+
+    parent = CreateWindowExA(0, "TestParentClass", "Test parent", WS_OVERLAPPEDWINDOW | WS_VISIBLE,
+                             100, 100, 200, 200, 0, 0, 0, NULL);
+    ok(parent != 0, "Failed to create parent window\n");
+
+    for (i = 0; i < ARRAY_SIZE(styles); i++)
+    {
+        struct button_desc *desc;
+        HWND hwnd;
+
+        hwnd = create_button(styles[i], parent);
+        ok(hwnd != NULL, "Failed to create a button.\n");
+
+        desc = (void *)GetWindowLongPtrA(hwnd, 0);
+        ok(desc != NULL, "Expected window data.\n");
+
+        if (desc)
+        {
+            ok(desc->self == hwnd, "Unexpected 'self' field.\n");
+            ok(desc->parent == parent, "Unexpected 'parent' field.\n");
+        }
+
+        DestroyWindow(hwnd);
+    }
+
+    DestroyWindow(parent);
+}
+
 START_TEST(button)
 {
     ULONG_PTR ctx_cookie;
@@ -995,6 +1051,7 @@ START_TEST(button)
     test_button_class();
     test_button_messages();
     test_note();
+    test_button_data();
 
     unload_v6_module(ctx_cookie, hCtx);
 }