Fix issue 4550, failed to run workqueue item due to earlier use of wrong wcroot. * subversion/libsvn_wc/wc_db.c (svn_wc__db_init): Update wcroot cache. * subversion/tests/cmdline/externals_tests.py (replace_tree_with_foreign_external): Remove XFAIL.
subversion/trunk/subversion/libsvn_wc/wc_db.c
subversion/trunk/subversion/tests/cmdline/externals_tests.py