Meta+Shift+C not sent to tmux

Unable to send Meta(Alt)+Shift+C to tmux. In fact, it seems that Meta+c is being sent. Also, even if it is not C-key, shift will be ignored for other keys as will.

I'm expecting Meta+Shift+C to be sent to tmux.

▼ .tmux.conf

# working
bind -n M-c new-window -c "#{pane_current_path}"

# not working. M-c new-window works instead
bind -n M-C new-session

Thank you

Tabby Ver: Alpha 1.0.159 Windows 10 Pro 21H1 WSL Ver 2 (Kernel Ver 5.10.60.1 / Ubuntu-20.04)

config file

```yml terminal: searchOptions: {} colorScheme: name: Material foreground: '#eceff1' background: rgba(0, 0, 0, 0) selection: null cursor: '#FFCC00' colors: - '#000000' - '#D62341' - '#9ECE58' - '#FAED70' - '#396FE2' - '#BB80B3' - '#2DDAFD' - '#d0d0d0' - rgba(255, 255, 255, 0.2) - '#FF5370' - '#C3E88D' - '#FFCB6B' - '#82AAFF' - '#C792EA' - '#89DDFF' - '#ffffff' font: Cica Regular hideCloseButton: true fallbackFont: Consolas Regular profile: local:custom:WSL-Ubuntu-18.04-copy:6be06603-6eb1-4a77-af27-60f83a502072 bell: visual copyOnSelect: true workingDirectory: //wsl$/Ubuntu-20.04/home/anoriqq fontSize: 36 ligatures: true scrollOnInput: false bracketedPaste: true rightClick: menu autoOpen: false customColorSchemes: - name: Material foreground: '#eceff1' background: rgba(0, 0, 0, 0) selection: null cursor: '#FFCC00' colors: - '#000000' - '#D62341' - '#9ECE58' - '#FAED70' - '#396FE2' - '#BB80B3' - '#2DDAFD' - '#d0d0d0' - rgba(255, 255, 255, 0.2) - '#FF5370' - '#C3E88D' - '#FFCB6B' - '#82AAFF' - '#C792EA' - '#89DDFF' - '#ffffff' altIsMeta: true showBuiltinProfiles: false showRecentProfiles: 0 background: colorScheme hotkeys: profile: {} shell: {} toggle-window: [] copy: [] paste: - - Alt-Shift-V home: [] end: [] previous-word: [] next-word: [] delete-previous-word: [] delete-next-word: [] zoom-in: [] zoom-out: [] reset-zoom: [] new-tab: [] ctrl-c: [] search: [] pane-focus-all: [] serial: [] settings: [] ssh: [] new-window: [] toggle-fullscreen: [] rename-tab: [] close-tab: [] reopen-tab: [] next-tab: [] previous-tab: [] move-tab-left: [] move-tab-right: [] tab-1: [] tab-2: [] tab-3: [] tab-4: [] tab-5: [] tab-6: [] tab-7: [] tab-8: [] tab-9: [] tab-10: [] split-right: [] split-bottom: [] pane-maximize: [] pane-nav-up: [] pane-nav-down: [] pane-nav-left: [] pane-nav-right: [] copy-current-path: [] select-all: [] clear: [] telnet-profile-selector: [] restart-telnet-session: [] ssh-profile-selector: [] restart-ssh-session: [] launch-winscp: [] restart-serial-session: [] toggle-last-tab: [] rearrange-panes: [] tab-11: [] tab-12: [] tab-13: [] tab-14: [] tab-15: [] tab-16: [] tab-17: [] tab-18: [] tab-19: [] tab-20: [] split-left: [] split-top: [] pane-nav-previous: [] pane-nav-next: [] close-pane: [] switch-profile: [] profile-selector: [] profile-selectors: {} serial: {} ssh: {} appearance: theme: Compact vibrancyType: blur opacity: 0.74 css: >- /* * { color: blue !important; } */ .xterm-screen, .xterm-text-layer, .xterm-selection-layer, .xterm-link-layer, .xterm-cursor-layer { width: 100% !important; // height: 100% !important; } enableWelcomeTab: false pluginBlacklist: - community-color-schemes - serial - ssh - telnet - theme-windows10 version: 3 profiles: - type: local name: PowerShell icon: >- options: command: powershell.exe args: - '-nologo' env: TERM: cygwin id: local:custom:PowerShell:bd110e9c-a3ba-4e5c-b6fc-6897c15bba14 group: Windows - type: local name: Ubuntu-18.04 options: command: C:\WINDOWS\system32\wsl.exe args: - '-d' - Ubuntu-18.04 env: TERM: xterm-color COLORTERM: truecolor cwd: //wsl$/Ubuntu-20.04/home/anoriqq group: WSL icon: >- id: local:custom:WSL-Ubuntu-18.04:2c9c8c30-0fec-4833-a36d-5b7852eaecff - type: local name: Ubuntu-20.04 options: command: C:\WINDOWS\system32\wsl.exe args: - '-d' - Ubuntu-20.04 env: TERM: xterm-color COLORTERM: truecolor cwd: //wsl$/Ubuntu-20.04/home/anoriqq group: WSL id: local:custom:WSL-Ubuntu-18.04-copy:6be06603-6eb1-4a77-af27-60f83a502072 icon: >- recoverTabs: false configSync: parts: {} profileDefaults: {} ```

Eugeny / tabby

Meta+Shift+C not sent to tmux #4815