Packages and Patterns explicitly removed should be flagged as soft taboo

[DaGammla]

Feature Request:

Packages and Patterns explicitly removed by a User should be flagged with a soft taboo.

• Items with this flag would then be prevented from being installed again through weak (recommended) dependencies.
• The flag would should be ignored when the User installs or updates with a config override to explicitly install recommended packages (e.g. zypper dup --recommends).
• Items with this flag should still be installed via hard dependencies
• The flag should be removed as soon as the user installs the item again (either through a hard dependency or directly)
• The usage of this flag should probably be configurabe (no behavior change in legacy systems)

Reasoning

Uninstalled packages "reappearing" after an update is a frequently cited annoyance by users not entirely familiar with libzypps solver.
Community members then frequently suggest ignoring all recommended packages (by setting onlyRequires = true). This however risks users missing out on quality of live updates / packages and may lead to a worsened user experience.

To be discussed

• What are the implications of such a change?
• Are there any reasons not to introduce such a feature?
• What would be a better fitting name for this flag as opposed to "soft taboo"?
• A possible roadmap for implementation