Bracketed paste issue with split escape sequence

Previous discussion: https://github.com/zyedidia/micro/discussions/3666

Description

I met a paste issue when SSH into Debian 12 servers from Windows Terminal, sometimes the pasted text is surrounded by 200 and 201 and lost formatting, looks like bracketed paste escape sequence is not processed correctly.

• Server
  Debian 12
  micro 2.0.14

• Client
  Windows 10
  Windows Terminal 1.21.10351.0
  OpenSSH 9.5

Diagnostic

Using raw mode, I saw a successful paste result a EventPaste but a distorted paste result a sequence of EventKey.

https://github.com/user-attachments/assets/a6ec66f5-46a6-45ea-91d9-35cd607dfbcc

import sys
import tty
import termios
import os
import atexit

@atexit.register
def restore_term():
   global old_settings
   if old_settings:
      termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old_settings)

old_settings=None

def init():
   global old_settings
   old_settings = termios.tcgetattr(sys.stdin)
   tty.setraw(sys.stdin)
   # Enable bracketed paste mode
   sys.stdout.write("\033[?2004h")
   sys.stdout.flush()

init()

while True:
    ch = os.read(sys.stdin.fileno(), 256)
    print(f"-> {repr(ch)[2:-1]}", end='\r\n')

Paste issues:

-> \x1b[200~issues\x1b[20
-> 1~
-> \x1b[200~issues\x1b[201~
-> \x1b[200~issues\x1b[201~
-> \x1b[200~issues\x1b[201~
-> \x1b[200~issues\x1b[20
-> 1~
-> \x1b[200~issues\x1b[201~

Seems related: https://github.com/microsoft/terminal/issues/4037

Reproduce the behavior with the provided Python raw-mode script while connecting to a Debian 12 server through Windows Terminal. Trace how split bracketed-paste escape sequences become EventKey instead of EventPaste; done when the paste remains formatted and is consistently reported as EventPaste.