HOWTO: Fix Calibre's broken window borders in Flatpak / Wayland

If you have a large collection of eBooks, you probably use Calibre - it's simply the best bit of cross-platform software for managing your library. It runs rock-solid on Linux. But a recent upgrade gave me a problem. I started the app and the windows were missing their borders and my mouse cursor was too small. Not show-stopping problems, but mildly annoying. After a bit of faffing around, I discovered the cause and how to fix it. I was running the Flatpak version of Calibre. Normally I…
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