tmux 3.7 adds floating panes

Category: Dev tools
Status: confirmed
Sources: GitHub release, release notes
Summary: tmux 3.7 was released on 2026-06-26. The headline early-release feature is floating panes that sit above tiled layouts like popups, currently moved and resized with the mouse. Copy mode gains line numbers with multiple styles and new scroll commands, clipboard handling adds bracket-paste detection and OSC 52 in popups, and read-only permission checks on attach, detach, and switch were tightened. Message formatting now overlays the status line rather than replacing it.
Why it matters: Floating panes are a long-requested layout primitive, and the read-only permission tightening affects shared-session setups.
Follow-up: Watch for floating-pane keybinding and scripting support beyond mouse control in later 3.7.x releases.