explorer: Move screen saver activation to the X11 driver.

dlls/winex11.drv/window.c

@@ -21,6 +21,7 @@
  */
 
 #include "config.h"
+#include "wine/port.h"
 
 #include <stdarg.h>
 #include <stdlib.h>
@@ -2764,6 +2765,25 @@ static BOOL is_netwm_supported( Display *display, Atom atom )
 
 
 /***********************************************************************
+ *              start_screensaver
+ */
+static LRESULT start_screensaver(void)
+{
+    if (root_window == DefaultRootWindow(gdi_display))
+    {
+        const char *argv[3] = { "xdg-screensaver", "activate", NULL };
+        int pid = _spawnvp( _P_DETACH, argv[0], argv );
+        if (pid > 0)
+        {
+            TRACE( "started process %d\n", pid );
+            return 0;
+        }
+    }
+    return -1;
+}
+
+
+/***********************************************************************
  *           SysCommand   (X11DRV.@)
  *
  * Perform WM_SYSCOMMAND handling.
@@ -2774,7 +2794,11 @@ LRESULT CDECL X11DRV_SysCommand( HWND hwnd, WPARAM wparam, LPARAM lparam )
     int dir;
     struct x11drv_win_data *data;
 
-    if (!(data = get_win_data( hwnd ))) return -1;
+    if (!(data = get_win_data( hwnd )))
+    {
+        if (wparam == SC_SCREENSAVE && hwnd == GetDesktopWindow()) return start_screensaver();
+        return -1;
+    }
     if (!data->whole_window || !data->managed || !data->mapped) goto failed;
 
     switch (wparam & 0xfff0)

programs/explorer/desktop.c

@@ -583,22 +583,6 @@ static void initialize_launchers( HWND hwnd )
     }
 }
 
-/* screen saver handler */
-static BOOL start_screensaver( void )
-{
-    if (using_root)
-    {
-        const char *argv[3] = { "xdg-screensaver", "activate", NULL };
-        int pid = _spawnvp( _P_DETACH, argv[0], argv );
-        if (pid > 0)
-        {
-            WINE_TRACE( "started process %d\n", pid );
-            return TRUE;
-        }
-    }
-    return FALSE;
-}
-
 static WNDPROC desktop_orig_wndproc;
 
 /* window procedure for the desktop window */
@@ -613,11 +597,9 @@ static LRESULT WINAPI desktop_wnd_proc( HWND hwnd, UINT message, WPARAM wp, LPAR
         {
         case SC_CLOSE:
             ExitWindows( 0, 0 );
-            break;
-        case SC_SCREENSAVE:
-            return start_screensaver();
+            return 0;
         }
-        return 0;
+        break;
 
     case WM_CLOSE:
         PostQuitMessage(0);