user32: Do not change focus if the window is no more active.

[Dmitry Timoshkov]

This patch fixes the problem in the application I'm working on.
The application prevents deactivation of one of its windows, and this
doesn't work without this patch.
---
 dlls/user32/focus.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/dlls/user32/focus.c b/dlls/user32/focus.c
index 3253a87..0924743 100644
--- a/dlls/user32/focus.c
+++ b/dlls/user32/focus.c
@@ -276,6 +276,9 @@ HWND WINAPI SetFocus( HWND hwnd )
         {
             if (!set_active_window( hwndTop, NULL, FALSE, FALSE )) return 0;
             if (!IsWindow( hwnd )) return 0;  /* Abort if window destroyed */
+
+            /* Do not change focus if the window is no more active */
+            if (hwndTop != GetActiveWindow()) return 0;
         }
     }
     else /* NULL hwnd passed in */
-- 
1.6.0.4