KITTY_DATA_START ends up in terminal when you CTRL+C out of an SSH-connection while it's not connected.

[ptrxyz]

Describe the bug
If you use the SSH kitten and ctrl+c out of the connection request, KITTY_DATA_START is still send to the terminal and interpreted by the user shell.

To Reproduce
Steps to reproduce the behavior:

1. Use kitty +kitten ssh 141.52.10.20 (some IP that you can not reach. the goal is to make the request last long enough to canel it)
2. press CTRL+C while it's trying to connect.
3. See error: the terminal will show "KITTY_DATA_START" followed by a lot of output ending with "KITTY_DATA_END". The output is treated as user input into the running shell.

Screenshots
Peek 2023-05-08 11-55.webm

Environment details

kitty 0.28.1 created by Kovid Goyal
Linux pedrolin 6.3.1-zen1-1-zen #1 ZEN SMP PREEMPT_DYNAMIC Mon, 01 May 2023 17:42:12 +0000 x86_64
Arch Linux 6.3.1-zen1-1-zen (/dev/tty)

Running under: X11
Frozen: False
Paths:
  kitty: /usr/bin/kitty
  base dir: /usr/lib/kitty
  extensions dir: /usr/lib/kitty/kitty
  system shell: /usr/bin/zsh
Loaded config files:
  /home/ptrxyz/.config/kitty/kitty.conf

Config options different from defaults:
active_tab_title_template {title}{'' if layout_name == 'fat' else ' [' + layout_name + ']'}
bold_font                 JetBrains Mono Medium
bold_italic_font          JetBrains Mono Medium,Italic
disable_ligatures         2
enable_audio_bell         False
font_family               JetBrains Mono Light
font_size                 12.0
input_delay               7
italic_font               JetBrains Mono Light,Italic
modify_font:
    cell_height 100%
window_padding_width      FloatEdges(left=15.0, top=15.0, right=15.0, bottom=15.0)
Colors:
	active_border_color       #b7bdf8   
	active_tab_background     #c6a0f6   
	active_tab_foreground     #181926   
	background                #24273a   
	bell_border_color         #eed49f   
	color0                    #494d64   
	color1                    #ed8796   
	color10                   #a6da95   
	color11                   #eed49f   
	color12                   #8aadf4   
	color13                   #f5bde6   
	color14                   #8bd5ca   
	color15                   #a5adcb   
	color16                   #ff52b7   
	color2                    #a6da95   
	color3                    #eed49f   
	color4                    #8aadf4   
	color5                    #f5bde6   
	color6                    #8bd5ca   
	color7                    #b8c0e0   
	color8                    #5b6078   
	color9                    #ed8796   
	cursor                    #f4dbd6   
	cursor_text_color         #24273a   
	foreground                #cad3f5   
	inactive_border_color     #6e738d   
	inactive_tab_background   #1e2030   
	inactive_tab_foreground   #cad3f5   
	mark1_background          #b7bdf8   
	mark1_foreground          #24273a   
	mark2_background          #c6a0f6   
	mark2_foreground          #24273a   
	mark3_background          #7dc4e4   
	mark3_foreground          #24273a   
	selection_background      #f4dbd6   
	selection_foreground      #24273a   
	tab_bar_background        #181926   
	url_color                 #f4dbd6   

Important environment variables seen by the kitty process:
	PATH                                ./node_modules/.bin:/home/ptrxyz/bin:/home/ptrxyz/.local/bin:/home/ptrxyz/.local/share/pnpm:/usr/local/sbin:/usr/local/bin:/usr/bin:/home/ptrxyz/.dotnet/tools:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl
	LANG                                en_US.UTF-8
	EDITOR                              vim
	SHELL                               /usr/bin/zsh
	DISPLAY                             :0
	USER                                ptrxyz
	LC_MONETARY                         de_DE.UTF-8
	XDG_SEAT                            seat0
	XDG_SESSION_TYPE                    x11
	LC_PAPER                            de_DE.UTF-8
	XDG_SESSION_CLASS                   user
	XDG_VTNR                            1
	XDG_SESSION_ID                      2
	LC_CTYPE                            en_US.UTF-8
	XDG_RUNTIME_DIR                     /run/user/1000
	LC_TIME                             de_DE.UTF-8
	LC_COLLATE                          en_US.UTF-8

Additional context
The problem can be reproduced with kitty --config NONE, as well as with different shells (fish, bash).

[ptrxyz]

Awesome! Thanks for the quick fix!