templatefilters: add commonprefix
The commonprefix filter takes a list of files names like files() and
returns the longest directory name common to all elements.
Differential Revision: https://phab.mercurial-scm.org/D3439
# 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