[Feedback] Few glitches at the UX of an upgrade process

[Dmitriusan]

Is your feature request related to a problem? Please describe.
I've recently used mintupgrade to update from 20.3 to 21.1. Overall, that is a great utility that makes the process easier. But a few glitches I spotted may be low-hanging fruits for improvements.

Describe the solution you'd like

mintupgrade window can be easily closed by a mistake.

It does not ask for any confirmation, and I've accidentally closed it a couple of times during the process. Suggestion: add a confirmation dialog when closing mintupgrade.

Counter-intuitive "Package repositories" dialog

"Package repositories" dialog lists PPAs that should be disabled. Clicking the "Fix" button just opens a main window of the "Software sources" utility. The "Fix" test on a button suggests that the suggested change will be applied automagically, and that is not obvious that the user has to switch to PPA tab of the "Software sources" utility, and disable PPAs manually. The suggestion here is to add an explanation text to "Package repositories" dialog, for example:

Clicking the "Fix" button will open "Software sources" utility. Please disable mentioned package repositories manually on "PPAs" tab of "Software sources" utility

Also, how about renaming the button to something like "Edit package repositories"

Foreign packages dialog is not clear

The "Foreign packages" suggests downgrading few packages. Again, what does "Fix" button mean here? Is mintupgrade utility going to apply the proposed change automagically, or should user perform something like sudo apt install shutter=75.0 manually? It would be great to add some explanation text to this dialog.

Orphan packages dialog does not allow copy-pasting package names

Maybe I did not get the idea, but as far as I understand, I have to type the names of all orphan packages I'd like to keep at Upgrade Tool preferences. It would be much easier if I could at least to copy-paste package names from Orphan packages dialog as a text. Even better (yet more complex) option would be to have a small "save icon" button near each package name at the list, so user would just click these buttons to keep some orphan packages installed.

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