With this change we emulate a case sensitive filesystem on top of
insensitive filesystems. This means we correctly pick up case-only renames
and throw a case conflict error when there would be multiple files differing
only in case.
This safety check has a small performance hit (about 20% more filesystem
operations when scanning for changes). The new advanced folder option
`caseSensitiveFS` can be used to disable the safety checks, retaining the
previous behavior on systems known to be fully case sensitive.
Co-authored-by: Jakob Borg <jakob@kastelo.net>
* lib/fs, lib/model: Improve filesystem operations during tests (fixes#5422)
Introduces MustFilesystem that panics on errors and should be used for operations
during testing which must never fail.
Create temporary directories outside of testdata.
* don't do a filesystem, just a wrapper around os for testing
* fix copyright
