handle content when it's an empty string

[augustfengd]

WHAT

🤖 Generated by Copilot at 19c74a2

Fix text document change handling for whole first line replacements in FsAutoComplete.Lsp.fs. Use named text instead of text edit to avoid line ending and offset issues.

🤖 Generated by Copilot at 19c74a2

text document change
special case for first line
autumn leaves falling

📝🐛🚀

WHY

FSAC currently crashes when the buffer is empty and we type something. I thought I saw the same behaviour on the F# Data Adaptive version, but I was wrong. Since the latter doesn't suffer from this edge case so no need for code change there.

Fixes #1091

HOW

🤖 Generated by Copilot at 19c74a2

• Add a special case for text document changes that replace the entire first line (link). This avoids potential issues with line endings and offsets when applying the change to the file system. This affects the FsAutoComplete.Lsp.fs file, which implements the F# language server protocol.

[TheAngryByrd]

Thanks!