i18n: use "encoding.lower()" to normalize specified keywords for log searching some problematic encoding (e.g.: cp932) uses ASCII alphabet characters in byte sequence of multi byte characters. "str.lower()" on such byte sequence may treat distinct characters as same one, and cause unexpected log matching. this patch uses "encoding.lower()" instead of "str.lower()" to normalize strings for compare.

win32mbcs: allow win32mbcs extension to be enabled on cygwin platform this patch allows win32mbcs extension to be enabled on cygwin platform for problematic character encodings. on recent cygwin platform, even though "os.path.supports_unicode_filenames" is False, "os.listdir()" and other path manipulation functions can return the result correctly decoded in unicode for invocations with unicode arguments, if locale is configured properly. existing code to check "os.path.supports_unicode_filenames" is kept to prevent win32mbcs from being enabled on unexpected platform.

windows: use normalized path as path to subrepo path to subrepo is used to identify or check location of subrepo. it should be normalized (in "/" delimiter form), because it is also used with narrowmatcher which uses only normalized path even on Windows environment. this patch applies "util.pconvert()" on path to subrepo (called "subpath") to normalize it. for this patch, referers of below were checked. - subrepo.state() - subrepo.itersubrepos() - subrepo.subrepo() - context.sub() - context.substate() typical usecase is: for subpath in ctx.substate: sub = ctx.sub(subpath) ... ctx.substate[subpath] .... in this case, normalization has no side effect, because keys given from substate are used as key itself. other cases shown below also seem to require subpath to be normalized. - path components are joined by "/", in "commands.forget()": for subpath in ctx.substate: subforget[subpath + '/' + fsub] = (fsub, sub) - normalized "file" is used to check below condition, in "commands.revert()", "localrepository.commit()", and "localrepository._checknested()" file in ctx.substate - substate.keys() is passed to dirstate.walk()/status() which use only normalized pathes

windows: use normalized path to check repository nesting current "localrepository._checknested()" uses specified path itself to compare against subrepo pathes. it is invoked from "hgsubrepo.subrepo()" or pathauditor (as callback), and both use "os.sep" as separator. this causes unexpected nesting check result, if subrepo configuration uses "/" as path separator for sub repo path. this path uses "/" to join path components (or apply "util.pconvert()" on path) to normalize.

windows: force specified path to be audited in localpath form pathauditor is invoked not only for localpath form using "os.sep" as separator, but also for normalized form using "/": for example, hg internal path like "store/data" under ".hg", or ones normalized by match object this causes insufficient repository nesting check, because current pathauditor implementation divides specified path into components by "os.sep", and this causes to treat multiple path components joined by "/" as single one on Windows environment. this patch applies "util.localpath()" on specified path to force it to be divided into components correctly. in fact, root for pathauditor also uses multiple path separator on Windows. but this does not affect audit itself, so "util.localpath()" is not applied on it.

icasefs: rewrite comment to explain situtation precisely

icasefs: follow standard cache look up pattern