[Merge] lp:~mandel/ciborium/disable-unmount-button into lp:ciborium

[Ricardo Salveti]

Review: Approve

The code that tracks the mount points could definitely be improved by removing the nested ifs, but I know you want to track this better on a following up mr.

Improves the current app quite a bit, so let's try landing this first.
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https://code.launchpad.net/~mandel/ciborium/disable-unmount-button/+merge/253031
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