• Feature: add collaboration support - multiple users using multiple cursors (https://github.com/zellij-org/zellij/pull/957)

This change adds collaboration features to Zellij, and as such is a breaking change UX-wise.

From this version, if you attach to the same Zellij session from different windows (or of course, from different machines!) - you'll get a cursor for each connected user. You can focus on different panes, or different tabs and see each other typing. To get the previous behaviour of mirroring every window, use options --mirror-session when starting the original session.