Preferences: Incomplete version check and update

[mixxxbot]

Reported by: uklotzde
Date: 2019-08-09T09:30:35Z
Status: Confirmed
Importance: Low
Launchpad Issue: lp1839599
Tags: easy, preferences

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The version check in preferences/upgrade.cpp is incomplete and doesn't work as expected. Often users will see the following warning when starting Mixxx:

Warning [Main]: Configuration file is at version "2.2.1" instead of the current 2.2.2

TODO:

• Upgrade version if no special action is required, not only for selected but for all future versions by default to avoid that this warning reappears.
• Never downgrade the version! This requires parsing and comparing version numbers, which is currently missing.

References:
https://mixxx.zulipchat.com/#narrow/stream/109171-development/topic/Release.202.2E2.2E2.20-.20Help.20needed/near/172836944

[mixxxbot]

Commented by: nopeppermint
Date: 2019-08-09T12:03:08Z

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#2231

[mixxxbot]

Commented by: nopeppermint
Date: 2019-08-09T12:13:39Z

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as this should also go into 2.1.x I created a new PR: #2232