extensions: show traceback on load failure if --traceback flag is set Before this patch, there was no handy way to investigate the reason why extension couldn't be loaded. If ui.debug is set, tracebacks of both "hgext.foo" and "foo" are displayed because the first ImportError could occur at very deep dependency module.

ui: flush stdout before writing traceback to stderr Sometimes a traceback message is paired with ui.debug(). This patch makes sure that these messages are displayed in the right order.

treemanifest: visit directory 'foo' when given e.g. '-X foo/ba?' For globs like 'foo/ba?', match._roots() will return 'foo'. Since visitdir(), excludes directories in the excluded roots, it would skip the entire foo directory. This is incorrect, since 'foo/ba?' doesn't mean that everything in foo/ should be exluded. Note that visitdir() is called only from the treemanifest class, so this only affects tree manifests. Fix by adding roots to the set of excluded roots only if there are no excluded patterns. Since 'glob' is the default pattern type for globs, we also need to update some -X patterns in the tests to be of 'path' type to take advantage of the visitdir tricks. For consistency, also update the -I patterns. It seems a little unfortunate that 'foo' in 'hg files -X foo' is considered a pattern because of the implied 'glob' type, but improving that is left for another day.