While doing a bit of work on Storm, I decided to try out the loom plugin for Bazaar. The loom plugin is designed to help maintain a stack of changes to a base branch (similar to quilt). Some use cases where this sort of tool are useful include:

1. Maintaining a long-running diff to a base branch. Distribution packaging is one such example.
2. While developing a new feature, the underlying code may require some refactoring. A loom could be used to keep the refactoring separate from the feature work so that it can be merged ahead of the feature.
3. For complex features, code reviewers often prefer to changes to be broken down into a sequence of simpler changes. A loom can help maintain the stack of changes in a coherent fashion.

A loom branch helps to manage these different threads in a coherent manner. Each thread in the loom contains all the changes from the threads below it, so the revision graph ends up looking something like this: