I have a HiDPI display so I often have to customize the `Exec` lines in `/usr/share/applications/*.desktop` files to add `--force-device-scale-factor=1.8`.

I'm finding that whenever Chrome or Spotify are upgraded by apt, this customization is lost. 

Is there a persistent way I can do this that wont be lost on upgrade? Didn't apt used to ask whether you wanted to keep or replace files when you had modified them and they needed to be upgraded?

Is there a better place I should be putting these 'patches'?