[Bug 2086771] Re: pkcon crashes in transaction with user prompt

[Alessandro Astone]

Installed packagekit=1.3.0-1ubuntu1 in Ubuntu 24.10

Verified both test plans. `pkcon` did not print out warnings nor
crashed.

** Tags removed: verification-needed verification-needed-oracular
** Tags added: verification-done verification-done-oracular

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Title:
  pkcon crashes in transaction with user prompt

Status in packagekit package in Ubuntu:
  Fix Released
Status in packagekit source package in Oracular:
  Fix Committed

Bug description:
  [ Impact ]

  `pkcon install <pkg>` crashes after install, and likewise
  `pkcon remove <pkg>` crashes after removal.

  More in general, all pkcon transactions that prompt the user with a
  question like "Proceed with changes? [N/y]" will crash after
  completing the transaction.

  This is fixed by correcting a reference counting issue which was
  causing a double-free.

  [ Test Case 1 ]
  1. Run `pkcon install 2048`
  2. Answer `n` to "Proceed with changes? [N/y]"
  3. Verify that pkcon does not print
       GLib-GObject-CRITICAL **: 12:02:00.011: g_object_unref: assertion 'G_IS_OBJECT (object)' failed

  [ Test Case 2 ]
  1. Run `pkcon install 2048`
  2. Answer `y` to "Proceed with changes? [N/y]"
  3. Complete the install
  4. Verify that pkcon did not crash with segmentation fault

  [ Where things could go wrong ]
  If the fix is too broad, we could be leaking memory, but pkcon is not a daemon anyways.
  If the fix is not broad enough, the issue might still be happening in specific cases we haven't tested.

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