Add easier tmux pane controls

config/alacritty/alacritty.toml

@@ -21,5 +21,8 @@ decorations = "None"
 bindings = [
 { key = "Insert", mods = "Shift", action = "Paste" },
 { key = "Insert", mods = "Control", action = "Copy" },
-{ key = "Return", mods = "Shift", chars = "\u001B\r" }
+# Send Shift+Return as CSI-u so TUIs can distinguish it from Return without treating it as Alt+Return.
+{ key = "Return", mods = "Shift", chars = "\u001B[13;2u" },
+# Legacy encoding sends Alt+Shift+Return the same as Alt+Return; send CSI-u so tmux can match M-S-Enter.
+{ key = "Return", mods = "Alt|Shift", chars = "\u001B[13;4u" }
 ]

config/foot/foot.ini

@@ -17,3 +17,9 @@ blink=no
 clipboard-copy=Control+Insert
 primary-paste=none
 clipboard-paste=Shift+Insert
+
+[text-bindings]
+# Send Shift+Return as CSI-u so TUIs can distinguish it from Return.
+\x1b[13;2u=Shift+Return
+# Send Alt+Shift+Return as CSI-u so tmux can match M-S-Enter.
+\x1b[13;4u=Mod1+Shift+Return

config/ghostty/config

@@ -25,6 +25,10 @@ shell-integration-features = no-cursor,ssh-env
 # Keyboard bindings
 keybind = shift+insert=paste_from_clipboard
 keybind = control+insert=copy_to_clipboard
+# Send Shift+Enter as CSI-u so TUIs can distinguish it from Enter.
+keybind = shift+enter=csi:13;2u
+# Legacy encoding sends Alt+Shift+Enter the same as Alt+Enter; send CSI-u so tmux can match M-S-Enter.
+keybind = alt+shift+enter=csi:13;4u
 keybind = super+control+shift+alt+arrow_down=resize_split:down,100
 keybind = super+control+shift+alt+arrow_up=resize_split:up,100
 keybind = super+control+shift+alt+arrow_left=resize_split:left,100

config/kitty/kitty.conf

@@ -13,6 +13,10 @@ confirm_os_window_close 0
 # Keybindings
 map ctrl+insert copy_to_clipboard
 map shift+insert paste_from_clipboard
+# Send Shift+Enter as CSI-u so TUIs can distinguish it from Enter.
+map shift+enter send_text all \e[13;2u
+# Kitty legacy encoding sends Alt+Shift+Enter the same as Alt+Enter; send CSI-u so tmux can match M-S-Enter.
+map alt+shift+enter send_text all \e[13;4u
 
 # Allow remote access
 allow_remote_control yes

config/tmux/tmux.conf

@@ -12,6 +12,10 @@ bind -T copy-mode-vi v send -X begin-selection
 bind -T copy-mode-vi y send -X copy-selection-and-cancel
 
 # Pane Controls
+bind -n M-Enter split-window -v -c "#{pane_current_path}"
+bind -n M-S-Enter split-window -h -c "#{pane_current_path}"
+bind -n M-Escape kill-pane
+
 bind h split-window -v -c "#{pane_current_path}"
 bind v split-window -h -c "#{pane_current_path}"
 bind x kill-pane
@@ -72,6 +76,7 @@ setw -g aggressive-resize on
 set -g detach-on-destroy off
 set -g extended-keys on
 set -g extended-keys-format csi-u
+set -g terminal-features[3] "xterm-kitty:extkeys"
 set -sg escape-time 10
 
 # Status bar