QR code at mailadm setup-bot is broken

[missytake]

When you run mailadm setup-bot, a QR code is shown, and an OPENPGP4FPR token which is supposed to be encoded in the QR code. This encoding doesn't work anymore, and the Delta Chat QR code scanner doesn't recognize it as a valid QR code anymore, neither do other online scanners like https://scanqr.org/. I suspect the new https://pypi.org/project/qrcode/#history release from yesterday, but let's investigate properly. try.webxdc.org still works, as a reference.

• Operating System (Linux/Mac/Windows/iOS/Android):
• Delta Chat Version:
• Expected behavior:
• Actual behavior:
• Steps to reproduce the problem:
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• Logs:

[missytake]

As a workaround, you can just copy-paste the OPENPGP4FPR token into the QR code scanner of the Delta Chat desktop client for now.

[missytake]

Shit, the same seems to be the case for the user adding QR codes.

[missytake]

Version 7.4.0 of the https://pypi.org/project/qrcode/#history library has introduced a bug, resulting in all QR codes mailadm generates being unreadable. We discovered this during a live test with users, very unfortunate.

I pushed a hotfix to master yesterday, pinning the qrcode version to 7.3.1 :) so it works again.

As soon as there is a working 7.4.1 release with a fix, #106 reverts the hotfix and introduces a test for our gen_qr() function, which was untested so far.