obsolete: drop usage of changectx in '_computecontentdivergentset'
Changectx are expensive and not needed there. The use of `repo.set` denote old
code that predate the introduction of `repo.revs` that we now use.
On my mercurial repository 495 draft:
before: 0.054239 second
after: 0.046935 second
On a mercurial repository with 115973 draft:
before: 0.564548 second
after: 0.130534 second
# 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