Fix the SIGWINCH interrupt makes the write operation think its failed, and causes it to try again

[o-sdn-o]

PR Summary

Fix the long-known issue of duplicate output

• Fix the SIGWINCH interrupt makes the write operation think its failed, and causes it to try again.
• Remove the workaround with ignoring the first WINDOW_BUFFER_SIZE_EVENT event. Prevent duplicated login message #426

PR Context

x-link directvt/vtm#819 (comment)

When a window resize event is received, the errno becomes EINTR which causes the write operation think its failed (some terminals generate this resize event when switching between alternate/normal buffer mode, etc).

Fixes PowerShell/Win32-OpenSSH#2275.

Related to:

• Shell prompt repeating when using ssh in terminal microsoft/terminal#407
• ConPTY(?) inserts broken control codes into tmux sessions. microsoft/terminal#7185
• ssh newline problem microsoft/terminal#8278
• watch command doesn't work properly microsoft/terminal#8869
• Display problem when using "less" command microsoft/terminal#9431
• OpenConsole: Duplicate output lines when connecting to Ubuntu via SSH microsoft/terminal#15769
• Spurious OSC 11 when using tmux over Windows' SSH microsoft/terminal#18004
• Spurious OSC 11 command ends up writing to terminal or even executing as commands when opening vim microsoft/terminal#18714
• Printing specific sequence causes device attributes sequence to appear microsoft/terminal#19120
• Escape sequences like DA responses can end up fragmented across multiple TCP/IP packets microsoft/terminal#19282
• Receiving duplicated response for a single device attribute request microsoft/terminal#19345
• Random letters are inserted on startup microsoft/edit#243
• Extra c0c Inserted At Beginning of File in Windows Docker Container microsoft/edit#377
• Strange characters at the beginning of file when creating or opening (when SSH'd from WSL to Windows 10) microsoft/edit#414
• Bug: "c2c" letter on the first buffer text in Wezterm terminal microsoft/edit#508
• Tmux output numbers separated by semicolon at startup tmux/tmux#3880
• tmux prints random characters when starting or attaching tmux/tmux#4535
• Responses to DA, DA2, background color requests get passed on to the client on Windows Terminal tmux/tmux#4634
• 11;rgb:0c0c/0c0c/0c0c gets printed on terminal when tmux start... seems to be inserted by the bash shell tmux/tmux#4642
• Tmux output numbers separated by semicolon at startup tmux-plugins/tpm#272
• Ghost characters appear when running tmux in a Win10->Linux ssh session directvt/vtm#819
• MotD duplicated when called from PowerShell Core Win32-OpenSSH#1253
• Wrong CR/LF behavior in ssh.exe Win32-OpenSSH#1256
• Prompt is printed twice when exiting nano Win32-OpenSSH#1376
• Prevent duplicated login message #426

I can guess why this fix might be delayed in merging: #674 (comment)

[o-sdn-o]

@microsoft-github-policy-service agree

[tgauth]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[boomshankerx]

This is infuriating. It's interrupting my entire workflow. Please make this a priority.