Remember monitor scale when switching configurations
When we e.g. generate switch configs (i.e. the ones from pressing the Super+P or the switch-config key on laptops), try a bit harder to find a "good" monitor scale.
With "good", it means pick a scale that was used in a previous configuration. In practice, this means that if you for example have configured your external monitor to use a specific scale, then pressed e.g. "built in only", and then switched back to e.g. "external only" or "linear", the generated configuration will use the scale that was previously configured.