Ref T5523. See PHI50. See PHI40. This isn't perfect, but should improve things.
Add a "Move tasks to column..." action to workboards which moves all visible tasks in a column to another column, either on the same board or on a different board.
This is a two-step process so that I don't have to write Javascript, and because I'm not 100% sure this is what users actually want/need. If it sticks, the UI could be refined later.
- The first dialog asks you to choose a project, defaulting ot the current project.
- The second dialog asks you to choose a column on that project's board.