[Feature request] Add OSC 9;9 support for PowerShell prompt in Cmder to enable Windows Terminal duplicate/split in same directory

[DRSDavidSoft]

Suggestion

Implement OSC 9;9 support in Cmder's PowerShell prompt so Windows Terminal can duplicate and split tabs/panes in the same working directory, matching the recent fix for cmd.exe/Clink and following Microsoft's published guidance.

Use case

Cmder's cmd.exe integration now emits OSC 9;9 via Clink for Windows Terminal, enabling 'Duplicate Tab' and 'Split Pane' to preserve the working directory. PowerShell users can manually add OSC 9;9 emission to their prompt (per MicrosoftDocs/terminal), but Cmder's PowerShell experience should work seamlessly out of the box.

Example implementation:

This can be integrated into the existing profile.ps1 script that Cmder uses.

function prompt {
  $loc = $executionContext.SessionState.Path.CurrentLocation
  $out = ""
  if ($env:WT_SESSION -and $loc.Provider.Name -eq "FileSystem") {
    $out += "$([char]27)]9;9;`"$($loc.ProviderPath)`"$([char]27)\"
  }
  $out += "PS $loc$('>' * ($nestedPromptLevel + 1)) "
  return $out
}

If posh-git is present, wrap $GitPromptScriptBlock and add OSC 9;9 as in Microsoft Docs.

Ensure the change is non-invasive and only active in Windows Terminal and ConEmu (detect what terminal we're running on, using environment variables).

Extra info/examples/attachments

• Reference: cmderdev/cmder#3024
• Upstream Clink patch: clink@bc612d9b244e3632077c072cdf1fabd289b97133
• Microsoft’s documentation for PowerShell: TerminalDocs/tutorials/new-tab-same-directory.md

Checklist:

• Add OSC 9;9 emission for PowerShell in Cmder’s default profile.
• Gate emission behind $env:WT_SESSION or the equivalent for ConEmu.
• Preserve user customizations and compatibility with posh-git/Starship (if any).
• Document the change in the PR.

Checklist

• I have read the documentation and made sure this feature doesn't already exist.
• I have searched for similar issues and found none that describe my feature request.