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Split helix_core::find_root and helix_loader::find_local_config_dirs (h…
…elix-editor#3929) * Split helix_core::find_root and helix_loader::find_local_config_dirs The documentation of find_root described the following priority for detecting a project root: - Top-most folder containing a root marker in current git repository - Git repository root if no marker detected - Top-most folder containing a root marker if not git repository detected - Current working directory as fallback The commit contained in helix-editor#1249 extracted and changed the implementation of find_root in find_root_impl, actually reversing its result order (since that is the order that made sense for the local configuration merge, from innermost to outermost ancestors). Since the two uses of find_root_impl have different requirements (and it's not a matter of reversing the order of results since, e.g., the top repository dir should be used by find_root only if there's not marker in other dirs), this PR splits the two implementations in two different specialized functions. In doing so, find_root_impl is removed and the implementation is moved back in find_root, moving it closer to the documented behaviour thus making it easier to verify it's actually correct * helix-core: remove Option from find_root return type It always returns some result, so Option is not needed
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