Complete path only to first common element

[golergka]

Issue

The UI to add the files is not very great now. For example, when I start to type something like ./s, I want to press Tab to complete to ./src so that I can start typing the name of the next subfolder. However, instead it gets complete to ./src/very/long/path/of/one/of/my/thousands/of/files.ts, which completely defends the purpose of Tab-based path completion.

If maintainer approves, I can take this improvement on myself.

Version and model info

No response

[5ocworkshop]

Different but related about adding and removing files: #2068