Tags

Tasks can be tagged, and tags belong to a project rather than being global. The tag list is made by people, so filtering by one is filtering by a word somebody on the team chose.

Moving a task to another project, from the task modal or by selecting several on a project page and choosing a project to move them to, asks which of their tags to take along. Every tag starts ticked. A ticked tag is put on the task as the new project's tag of the same name, matched regardless of capitals, and is made in the new project when it has none. An unticked tag stays behind. Moves that do not ask, such as from the mobile app, keep every tag. Tags never move between companies: moving a task into a project that belongs to another company says which tags stay behind, and the task arrives without them. Moving a task needs access to the project it is going to as well as to the task.