[Merge] ~eeickmeyer/software-properties:ubuntu/master into software-properties:ubuntu/master

[Erich Eickmeyer]

Erich Eickmeyer has proposed merging ~eeickmeyer/software-properties:ubuntu/master into software-properties:ubuntu/master.

Commit message:
Port of qt/DialogMirror.py to Qt6

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #2122357 in software-properties (Ubuntu): "[SRU] Dialog not opening after selecting "Other" for Ubuntu Software source"
  https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/2122357

For more details, see:
https://code.launchpad.net/~eeickmeyer/software-properties/+git/software-properties/+merge/492331

See LP: #2122357

This will also need a backport to plucky
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~eeickmeyer/software-properties:ubuntu/master into software-properties:ubuntu/master.
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