patchbomb: respect HGPLAIN when piping --test output to PAGER
It makes easy to use `hg email --test` from another tool.
#!/bin/sh
# test update logic when there are renames
# update with local changes across a file rename
hg init a
cd a
echo a > a
hg add a
hg ci -m a
hg mv a b
hg ci -m rename
echo b > b
hg ci -m change
hg up -q 0
echo c > a
hg up
cd ..