.editorconfig

setdiscovery: use revsets for computing a subset's heads and roots

revlogdag.headsetofconnecteds() obtains the set of DAG heads in a
given set of revs.

revlogdag.inverse() inverts the DAG order and makes
headsetofconnecteds() obtain the DAG roots in a given subset.

Both of these can be expressed with a revset.

Like other patches in this series, revlogdag uses revlog.index
and thus doesn't take filtering into account. Revsets do. So there
is a chance for regressions with this change. But no tests fail.
And I think this code should take filtering into account since
hidden changesets shouldn't factor into discovery (unless operating
on the hidden repository).

Differential Revision: https://phab.mercurial-scm.org/D4321

# See http://EditorConfig.org for the specification

root = true

[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true

[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true

[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false