Ctrl+Shift+Arrow_key keypresses do not generate any escape sequence

[unxed]

Describe the bug
Right arrow key sends \x1b[C, that's correct
Shift+Right_arrow_key sends \x1b[1;2C, that's correct
Ctrl+Shift+Right_arrow_key sends no escape sequence at all. But it should be \x1b[1;6C (as in GNOME Terminal, for example)

To Reproduce
Steps to reproduce the behavior:

1. Run kitty
2. Run any app that displays received escape sequences on stdout
3. Press Ctrl+Shift+Right_arrow_key
4. No escape sequence is generated

Environment details

kitty 0.26.5 created by Kovid Goyal
Linux rcnb 5.15.0-53-generic #59-Ubuntu SMP Mon Oct 17 18:53:30 UTC 2022 x86_64
Linux Mint 21 Vanessa rcnb /dev/tty

DISTRIB_ID=LinuxMint
DISTRIB_RELEASE=21
DISTRIB_CODENAME=vanessa
DISTRIB_DESCRIPTION="Linux Mint 21 Vanessa"
Running under: X11
Frozen: True
Paths:
  kitty: /home/unxed/.local/kitty.app/bin/kitty
  base dir: /home/unxed/.local/kitty.app/lib/kitty
  extensions dir: /home/unxed/.local/kitty.app/lib/kitty-extensions
  system shell: /bin/bash

Config options different from defaults:

Important environment variables seen by the kitty process:
	PATH                                /home/unxed/.local/kitty.app/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
	LANG                                ru_RU.UTF-8
	SHELL                               /bin/bash
	DISPLAY                             :0
	USER                                unxed
	XDG_CONFIG_DIRS                     /etc/xdg/xdg-cinnamon:/etc/xdg
	XDG_SESSION_PATH                    /org/freedesktop/DisplayManager/Session0
	XDG_SEAT                            seat0
	XDG_SESSION_DESKTOP                 cinnamon
	XDG_SESSION_TYPE                    x11
	XDG_GREETER_DATA_DIR                /var/lib/lightdm-data/unxed
	XDG_CURRENT_DESKTOP                 X-Cinnamon
	XDG_SEAT_PATH                       /org/freedesktop/DisplayManager/Seat0
	XDG_SESSION_CLASS                   user
	XDG_VTNR                            7
	XDG_SESSION_ID                      c2
	XDG_RUNTIME_DIR                     /run/user/1000
	XDG_DATA_DIRS                       /usr/share/cinnamon:/usr/share/gnome:/home/unxed/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share

[kovidgoyal]

ctrl+shift+right is mapped to the next_tab action by default. Unmap it
if you want to use it in a terminal program.