Currently if the user specifies a ref to install that has been renamed
via the end-of-life-rebased mechanism, for example "flatpak install
com.visualstudio.code.oss", Flatpak erroneously tries to install both
the old and new versions of the app. This happens because the code
handling end-of-life-rebase conditions is written assuming the rebased
app is being updated rather than installed for the first time.
Specifically, in FlatpakCliTransaction and FlatpakQuietTransaction, in
end_of_lifed_with_rebase(), we treat a failure of
flatpak_transaction_add_uninstall() as fatal and return FALSE from the
signal handler, which means that the install operation that triggered
the signal will not be skipped (see the docs for
FlatpakTransaction::end-of-lifed-with-rebase).
So, instead check for the FLATPAK_ERROR_NOT_INSTALLED error code and
ignore it, so that the installation of the old version of the renamed
app will be properly cancelled.
Fixes https://github.com/flatpak/flatpak/issues/3754
3aa9a7f3a1