* `spack config edit` can now open malformed YAML files. (#51088)

* `spack edit -b` supports specifying the repository path or its namespace. (#51084)

* `spack repo list` escapes the color code for paths that contain `@g`. (#51178)

* Fixed various issues on the solver:

* Improved the error message when an invalid dependency is specified in the input. (#51176)

* Build the preferred compiler with itself by default. (#51201)

* Fixed a performance regression when using `unify:when_possible`. (#51226)

* Fixed an issue with strong preferences, when provider details are given. (#51263)

* Fixed an issue when specifying flags on a package that appears multiple times in the DAG. (#51218)

* Fixed a regression for `zsh` in `spack env activate --prompt`. (#51258)

* Fix a few cases where the `when` context manager was not dealing with direct dependencies correctly. (#51259)

* Various fixes to string representations of specs. (#51207)

* Various improvements to the documentation (#51145, #51151, #51147, #51181, #51172, #51188, #51195)

* Greatly improve the performance of `spack diff`. (#51270)

* `spack solve` highlights optimization weights in a more intuitive way. (#51198)