Swap to to SDXL model by default in image generator if currently using SDXL

At the moment, when I click on "swap", the selection will default to SD1.5 models. It would be nice if the U.I. knows that I was using a SDXL model, so it is more likely that I want to swap to another SDXL model as well.

Even better would be for the system to also remember the last 5 or 6 models used and display them as first choices.