- Outside Windows a `\` stays part of a hidden library's or sent path's
file name; another platform's absolute path is still split on `\`.
- A hidden relative path is matched after leading `./` and `../` parts
only when they start the path, so `/work/./data/icon.svg` keeps its
text.
- `ui.inspect` and `ui.docking` replies are hidden once, so a library
at the top of the file system shows as `loaded/<file name>` with its
separator.
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