uxtheme: Check only the lower 16 bits of the return value of WM_ERASEBKGND.

call_dialog_proc16() truncates the return values from 16-bit application window procedures to 16 bits. Since WINPROC_CallDlgProcA() is not available in uxtheme, CallWindowProcW() is used instead and the higher bits should be ignored as well. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52713Signed-off-by: Zhiyi Zhang <zzhang@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

uxtheme: Check only the lower 16 bits of the return value of WM_ERASEBKGND.
1c5e5ded · Zhiyi Zhang · Alexandre Julliard · f1d1d88c · 1c5e5ded
Commit 1c5e5ded authored Mar 24, 2022 by Zhiyi Zhang Committed by Alexandre Julliard Mar 28, 2022
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dialog.c dlls/uxtheme/dialog.c +1 -1

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--- a/dlls/uxtheme/dialog.c
+++ b/dlls/uxtheme/dialog.c
@@ -129,7 +129,7 @@ LRESULT WINAPI UXTHEME_DefDlgProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp, BOO
    case WM_ERASEBKGND:
    {
        dlgproc = (WNDPROC)GetWindowLongPtrW(hwnd, DWLP_DLGPROC);
-        lr = CallWindowProcW(dlgproc, hwnd, msg, wp, lp);
+        lr = LOWORD(CallWindowProcW(dlgproc, hwnd, msg, wp, lp));
        if (lr)
            return lr;