Block resize if already this size.

While this feature is part of other branches for testing EGFX
integration, it somehow never made it into devel. This should fix
neutrinolabs#1928, for real this time!

xrdp/xrdp_mm.c

@@ -1041,6 +1041,17 @@ process_dynamic_monitor_description(struct xrdp_wm *wm,
             description->session_width, description->session_height);
         return 0;
     }
+    if (description->session_width
+            == wm->client_info->display_sizes.session_width
+            && description->session_height
+            == wm->client_info->display_sizes.session_height)
+    {
+        LOG(LOG_LEVEL_WARNING, "process_display_control_monitor_layout_data:"
+            " Not resizing. Already this size. (w: %d x h: %d)",
+            description->session_width,
+            description->session_height);
+        return 0;
+    }
 
     // TODO: Unify this logic with server_reset
     error = libxrdp_reset(wm->session,