If the window is already the topmost window in ShowWindow(SW_SHOW), it

must not be activated.

If the window is already the topmost window in ShowWindow(SW_SHOW), it
8623fdc2 · Francis Beaudet · Alexandre Julliard · 34264f26 · 8623fdc2
Commit 8623fdc2 authored Aug 07, 1999 by Francis Beaudet Committed by Alexandre Julliard Aug 07, 1999
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winpos.c windows/winpos.c +9 -0

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--- a/windows/winpos.c
+++ b/windows/winpos.c
@@ -1331,6 +1331,15 @@ BOOL WINAPI ShowWindow( HWND hwnd, INT cmd )
            /* fall through */
 	case SW_SHOW:
 	    swp |= SWP_SHOWWINDOW | SWP_NOSIZE | SWP_NOMOVE;
+
+	    /*
+	     * ShowWindow has a little peculiar behavior that if the
+	     * window is already the topmost window, it will not
+	     * activate it.
+	     */
+	    if (GetTopWindow((HWND)0)==hwnd)
+	      swp |= SWP_NOACTIVATE;
+
 	    break;

 	case SW_SHOWNOACTIVATE: