[$] Producing an application for both desktop and mobile

These days applications are generally moving away from the desktop andtoward the mobile space. But taking a multi-platform desktop application and addingtwo mobile platforms into the mix is difficult to do, as Dirk Hohndeldescribed in his linux.conf.au2019 talk. Hohndel maintains the Subsurface dive log application,which has added mobile support over the past few years; he wanted to explain the processthat the project went through to support all of those platforms.As the subtitle of the talk, "Developing for multiple platforms withoutlosing your mind", indicates, it is a hard problem to solve sanely.