session-tree-root: preference variable

Default value: "NONE"

If nonempty, when Epsilon searches for a session file in the current directory tree, it only examines directories that are children of this directory. For example, if session-tree-root holds \joe\proj, and the current directory is \joe\proj\src, Epsilon will search in \joe\proj\src, then \joe\proj, for a session file. If the current directory is \joe\misc, on the other hand, Epsilon won't search at all (since \joe\misc isn't a child of \joe\proj), but will use the rules in the previous paragraph. By default, session-tree-root is set to an impossible absolute pathname, so searching is disabled.

More info:

Locating The Session File

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