Summary

This PR adds support for floating panes, similar to tmux's popup feature.

• Fixes add support for popup window #270
• Based on work by @e82eric (PR Float Pane #5576) and @quantonganh (PR add support for floating pane #7107)

New Config Options

config.floating_pane_padding = {
  left = '20%', right = '20%', top = '20%', bottom = '20%'
}
config.floating_pane_border = {
  left_width = '0.5cell', right_width = '0.5cell',
  bottom_height = '0.25cell', top_height = '0.25cell',
  left_color = '#665c54', ...
}

New Key Assignments

CLI Support

wezterm cli spawn --floating-pane

Changes

• 27 files changed, ~1,300 lines added
• Core logic in mux/src/tab.rs (TabInner with floating_panes support)
• New MuxNotification variants for floating pane state changes
• Rendering support with scrollbar handling
• Multiplexer protocol support for remote sessions

Test Plan

• Build succeeds: cargo build --release
• Create floating pane with SpawnCommandInNewFloatingPane action
• Toggle floating pane visibility with ToggleFloatingPane
• wezterm cli list shows floating panes correctly
• Multiplexer detach/reattach preserves floating pane state
• CLI wezterm cli spawn --floating-pane works

🤖 Generated with Claude Code

Co-Authored-By: e82eric e82eric@users.noreply.github.com
Co-Authored-By: Quan Tong quantonganh@gmail.com