- Patch by Vincent Povirk, Handle undocumented WM_POPUPSYSTENNEBU message.

svn path=/trunk/; revision=36596

reactos/dll/win32/user32/windows/defwnd.c

@@ -1032,6 +1032,18 @@ User32DefWindowProc(HWND hWnd,
             return DefWndNCCalcSize(hWnd, (BOOL)wParam, (RECT*)lParam);
         }
 
+        case WM_POPUPSYSTEMMENU:
+        {
+            /* This is an undocumented message used by the windows taskbar to
+               display the system menu of windows that belong to other processes. */
+            HMENU menu = GetSystemMenu(hWnd, FALSE);
+
+            if (menu)
+                TrackPopupMenu(menu, TPM_LEFTBUTTON|TPM_RIGHTBUTTON,
+                               LOWORD(lParam), HIWORD(lParam), 0, hWnd, NULL);
+            return 0;
+        }
+
         case WM_NCACTIVATE:
         {
             return DefWndNCActivate(hWnd, wParam);

reactos/dll/win32/user32/windows/spy.c

@@ -559,7 +559,8 @@ static const char * const MessageTypeNames[SPY_MAX_MSGNUM + 1] =
     "WM_PALETTEISCHANGING",
     "WM_PALETTECHANGED",
     "WM_HOTKEY",                /* 0x0312 */
-          NULL, NULL, NULL, NULL,
+    "WM_POPUPSYSTEMMENU",       /* 0x0313 */
+    NULL, NULL, NULL,
     "WM_PRINT",
     "WM_PRINTCLIENT",
     NULL, NULL, NULL, NULL, NULL, NULL, NULL,

reactos/include/psdk/winuser.h

@@ -1726,6 +1726,7 @@ extern "C" {
 #define WM_TIMECHANGE 30
 #define WM_TIMER 275
 #define WM_SYSTIMER 280
+#define WM_POPUPSYSTEMMENU 787
 #define WM_UNDO 772
 #define WM_USER 1024
 #define WM_USERCHANGED 84