Fix GoalPrivate::operator= not resetting resolve-time members

GoalPrivate::operator= was missing resets for several members that were added after the original implementation. Most critically, transaction_user_installed and transaction_group_reason bitmaps were never reset, causing ‘Id is out of bitmap range’ crashes when Goal::resolve() was called multiple times in the same session (e.g. via dnf5daemon-server when gnome-software installs multiple local RPMs).

The fix aligns operator= with the copy constructor:

Reset resolve-time artifacts (transaction_group_reason, transaction_user_installed)
Copy input pointers (exclude_from_weak, user_installed_packages)
Reset resolve-time state (clean_deps_present, groups, environments, reason_changes)

Fixes: https://github.com/rpm-software-management/dnf5/issues/2756 Assisted-by: GitHub Copilot

DNF5

DNF5 is a command-line package manager that automates the process of installing, upgrading, configuring, and removing computer programs in a consistent manner. It supports RPM packages, modulemd modules, and comps groups and environments.

As part of the DNF5 stack, libdnf is the package management library. It was originally written to support the DNF package manager, but gradually grew up into a versatile library. You can now use libdnf to build custom tools that load repositories, query packages, resolve dependencies, and install packages.

DNF5 is also powered with the libsolv library which provides an easy to use programming interface.

By using DNF5, you can work with the following artifacts:

RPM repositories (repomd)
RPM packages
Comps groups
Comps environments
Advisories (updateinfo, errata)
Modules (modulemd)

DNF5 is written in C++ and it can interface with the following programming languages:

C++ - fully supported.
Python 3 - fully supported.
Perl 5 - best effort.
Ruby - best effort.

Note, however, that DNF5 cannot yet interface with the following programming languages:

Go - does not work, we are looking for contributors.
C - not implemented, not a priority for any of our existing API users.

Join us on IRC at #dnf on Libera.Chat. Questions should be asked there, issues discussed. Remember: #dnf is not a support channel, and prior research is expected from the questioner.

Installing DNF5

DNF5 is available since Fedora 38. To install the DNF5 package manager, use either of the following commands, depending on your Fedora release:

Fedora release	Command
37	`sudo dnf copr enable rpmsoftwaremanagement/dnf-nightly && sudo dnf install dnf5`[^dnf-nightly]
38 or newer	`sudo dnf install dnf5`
[^dnf-nightly]: https://copr.fedorainfracloud.org/coprs/rpmsoftwaremanagement/dnf-nightly

Note: dnf-nightly provides nightly builds for the entire DNF stack. Once you enable this repository you will start receiving updates for DNF, libdnf, and for the other packages of the stack.

Documentation

DNF5 HTML Documentation
The header files are documented because documentation is mainly generated from these files.

Contributing to the DNF5 project

For details about how to contribute to the DNF5 project, see CONTRIBUTING.md.

By contributing to the DNF5 project you agree with the Developer Certificate of Origin (DCO). DCO contains a simple statement that you, as a contributor, have the legal right to submit a contribution. For more details, see the DCO file.
All contributions to this project are licensed under LGPLv2.1+ or GPLv2+. For more details, see the License section.

Reporting issues

To report an issue (except of issues in the translations), use either of the following methods:

Create a GitHub issue [backlog].
File a bug by using the Red Hat Bugzilla tool. [backlog]

To report an issue in the translated messages:

Correct the message yourself at Fedora Weblate.
Mark the message as Needs editting at the same place.
Contact a translator of the affected translation catalog directly.

Developing DNF5 by building and testing the code

For details about building and testing DNF5, see the Development environment setup section.

Translating

Translating DNF5 from English to other languages happens at Fedora Weblate translation web site.

A GitHub workflow extracts new English messages from this repository every day and commits them to dnf5-l10n repository. The translation web site then presents them to its users who translate them there and the web site saves the finished translations back to the dnf5-l10n repository. Finally, the translation catalogs from that repository are copied into this repository just before every DNF5 release.

License

The DNF5 libraries are licensed under LGPLv2.1+.
The standalone programs that are part of the DNF5 project are licensed under GPLv2+.

For more details about licenses, see COPYING.