copies-rust: use matching to select the final copies information
This is a bit more idiomatic and this prepare a future refactoring where
InternalCopies from both parent would be updated at the same time.
Differential Revision: https://phab.mercurial-scm.org/D9647
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
end_of_line = lf
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
end_of_line = lf
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false
end_of_line = lf