Summary

• psmux C-b q implements “type a number to select a pane” (e.g., typing 2 focuses pane 2), which could be intentional.
• However it still diverges from tmux defaults and has a clear input/terminal desync issue while the pane-number overlay is active:
  1. pane numbering: tmux default is 0-based; psmux shows 1-based indices
  2. lifetime/exit: tmux shows briefly (default ~1s) and exits on any non-prefix keypress; psmux remains until Escape or a selection
  3. input handling: while the overlay is visible, normal keypresses are passed through to the underlying pane program, and the underlying program’s visible input becomes desynced/laggy (characters appear delayed / in batches)

Environment

• OS: Windows 11
• Terminal: Windows Terminal
• Shell: PowerShell 7
• psmux: 0.4.7
• tmux (parity reference): 3.6a (no user config, default bindings)
• Config state for verification: reproduced with default config for psmux

Expected (tmux default behavior)

• C-b q shows pane indices using tmux defaults (0-based unless pane-base-index is changed).
• Overlay duration is controlled by display-panes-time (default ~1000ms) and it closes on any keypress.
• While the overlay is visible:
  • pressing a digit selects that pane (tmux uses 0–9)
  • other keypresses dismiss the overlay
  • keystrokes used during the overlay are handled by tmux and do not get delivered to the underlying pane program
  • underlying pane input/display should not become visually desynced

Actual (psmux 0.4.7)

• Pane indices shown by C-b q are 1-based.
• Overlay remains visible until:
  • a pane is selected by typing a number, or
  • Escape is pressed.
• While the overlay is visible, normal typing is delivered to the underlying pane program.
• The underlying pane’s visible input becomes desynced/laggy (characters appear delayed / in batches), e.g.:
  • type a -> underlying program shows a
  • type b -> underlying program still shows a
  • type c -> underlying program shows ab
  • type d -> underlying program shows abc
  • (continues: display lags behind typed keys / updates inconsistently)
• This leaves the terminal state visually inconsistent while the overlay is active until it is dismissed.

Reproduction

1. Start a fresh attached psmux 0.4.7 session (default config).
2. Create multiple panes (e.g., Ctrl+b %).
3. Ensure the active pane is running an interactive program that echoes input (e.g., PowerShell prompt).
4. Press Ctrl+b q to show pane indices.
5. While the overlay is visible, type a, b, c, d (or any sequence of characters).

Result:

• Observed:
  • non-numeric keystrokes pass through to the underlying pane program while the overlay is visible
  • underlying program’s visible input lags/desyncs in the pattern above
  • overlay remains up until Escape or a numeric selection is made
• Expected (tmux default):
  • overlay closes quickly (default ~1s) and/or closes on any keypress
  • keystrokes used during the overlay do not pass through to the underlying program
  • no underlying input/display desync

Result

C-b q diverges from tmux defaults (index base and overlay lifetime), and passing keystrokes through while the overlay is active causes underlying pane input/display desynchronization.