winhelp: fix WINHELP_DeleteWindow

[Kirill K. Smirnov]

  ChangeLog:
    Fix WINHELP_DeleteWindow while deleting active window
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diff --git a/programs/winhelp/winhelp.c b/programs/winhelp/winhelp.c
index 389ba5a..808a760 100644
--- a/programs/winhelp/winhelp.c
+++ b/programs/winhelp/winhelp.c
@@ -1781,6 +1798,13 @@ static void WINHELP_DeleteWindow(WINHELP
         }
     }
 
+    if (Globals.active_win == win)
+    {
+        Globals.active_win = Globals.win_list;
+        if (Globals.win_list)
+            SetActiveWindow(Globals.win_list->hMainWnd);
+    }
+
     for (b = win->first_button; b; b = bp)
     {
         DestroyWindow(b->hWnd);