I found a good approach to the 'getting that APP-ID for scale-to-fit' problem and scripted it up. It even works with flathub apps!

Credits go to @agx's blog.

Mirage (github.com/mirukana/mirage), a Python/QML Matrix client with support for E2E encryption, works just fine on the .
You will have to use the tab key to enter your password, but otherwise it's fine. It can be installed on Arch and Manjaro from the AUR (matrix-mirage-git).

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