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When the output device has hotplug_mode_update (e.g. the qxl driver used in vms), the displays can be dynamically resized, so the current display configuration does not often match a stored configuration. When a new monitor is added, make_default_config() tries to create a new display configuration by choosing a stored configuration with N-1 monitors, and then adding a new monitor to the end of the layout. Because the stored config doesn't match the current outputs, apply_configuration() will routinely fail, leaving the additional display unconfigured. In this case, it's more useful to just fall back to creating a new default configuration from scratch so that all outputs get configured to their preferred mode.