[rchl]

Fixes #1491

Sublime Text keeps folders in the window after they were deleted from disk. LSP used the first such folder as the server's working directory, which made spawning the process fail (e.g. NotADirectoryError on Windows). The folder was also sent to the server as rootUri / rootPath / workspaceFolders.

Changes:

• sorted_workspace_folders() skips folders that don't exist, so they are neither used as cwd nor reported to the server. If all folders are gone, the session starts without workspace folders.
• _start_subprocess() falls back to the default working directory (with a debug log) when the requested cwd doesn't exist. This also covers a cwd returned from a plugin's on_pre_start.
• Tests for missing folders; test_longest_prefix now uses real temp directories since it relied on non-existent paths.

Note: a folder deleted while a session is already running is not handled here (ST doesn't report a folder change in that case).

[mataha]

Can confirm it's working as intended (log below).

Log

Unable to open /D/coding/.cloned/wontexistinamoment/script.py
LSP: working directory D:\coding\.cloned\wontexistinamoment does not exist, using current working directory instead
LSP: starting ['C:\\Users\\Mataha\\AppData\\Local\\Sublime Text\\Package Storage\\LSP-ruff\\.venv\\Scripts\\ruff', 'server'] in C:\Program Files\Sublime Text
LSP: LSP-ruff: Supported execute commands: ['ruff.applyFormat', 'ruff.applyAutofix', 'ruff.applyOrganizeImports', 'ruff.printDebugInformation']
LSP: LSP-ruff: supported code action kinds: ['quickfix', 'source.fixAll.ruff', 'source.organizeImports.ruff', 'notebook.source.fixAll.ruff', 'notebook.source.organizeImports.ruff']
[LSP-ty][INFO] Downloading server tarball: https://github.com/astral-sh/ty/releases/download/0.0.86/ty-x86_64-pc-windows-msvc.zip
LSP: starting ['C:\\Users\\Mataha\\AppData\\Local\\Sublime Text\\Package Storage\\LSP-ty\\v0.0.86\\ty.exe', 'server'] in C:\Program Files\Sublime Text
LSP: LSP-ruff: registering capability: didChangeWatchedFilesProvider
LSP: LSP-ruff: registering capability: documentFormattingProvider
LSP: LSP-ruff: registering capability: rangeFormattingProvider
LSP: LSP-ty: Supported execute commands: ['ty.printDebugInformation']
LSP: LSP-ty: supported code action kinds: ['quickfix']
LSP: LSP-ty: Supported semantic token types: ['namespace', 'class', 'parameter', 'selfParameter', 'clsParameter', 'variable', 'property', 'function', 'method', 'keyword', 'string', 'number', 'decorator', 'builtinConstant', 'typeParameter', 'operator', 'regexp']
LSP: LSP-ty: Supported semantic token modifiers: ['definition', 'readonly', 'async', 'documentation']
LSP: LSP-ty: registering capability: didChangeWatchedFilesProvider