.hgtags

dirstate: centralize _cwd handling into _cwd method

Before this patch, immediate value is assigned to dirstate._cwd, if
ui.forcecwd is specified at instantiation of dirstate.

But this doesn't work as expected in some cases.

For example, hgweb set ui.forcecwd after instantiation of repo object.
If an extension touches repo.dirstate in its reposetup(), dirstate is
instantiated without setting ui.forcecwd, and dirstate.getcwd()
returns incorrect result.

In addition to it, hgweb.__init__() can take already instantiated repo
object, too. In this case, repo.dirstate might be already
instantiated, even if all enabled extensions don't so in their own
reposetup().

To avoid such issue, this patch centralizes _cwd handling into _cwd
method.

This issue can be reproduced by running test-hgweb-commands.t with
fsmonitor-run-tests.py.

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