scmutil: make cleanupnodes handle filtered node In some valid usecases, the "mapping" received by scmutil.cleanupnodes have filtered nodes. Use unfiltered repo to access them correctly. The added test case will fail with the old cleanupnodes code. This is important to migrate histedit to use the cleanupnodes API.

configitems: add alias support in config Aliases define optional alternatives to existing options. For example the old option ui.user was deprecated and replaced by ui.username. With this mechanism, it's even possible to create an alias to an option in a different section. Add ui.user as alias to ui.username as an example of this concept. The old alternates principle in ui.config is removed as it was used only for this option.

hgweb: use ui._unset to prevent a warning in configitems

dispatch: fix typo suggestion for disabled extension If the matching command lives in an in-tree extension (which is all we scan for), and the user has disabled that extension with "extensions.<name>=!", we were not finding it, because the path in _disabledextensions was the empty string. If the user had set "extensions.<name>=!<valid path>" it would work, so it seems like just a mistake that it didn't work.

tests: add tests for typoed commands This includes one test showing how disabling a command with e.g. "extensions.rebase=!" results in the command not being suggested. We'll fix that next.

sparse: inline signature cache clearing It is a trivial one-liner. No need to have a separate function.

sparse: move working directory refreshing into core This is a pretty straightforward move of the code. I converted the "force" argument to a keyword argument. Like other recent changes, this code is tightly coupled with working directory update code in merge.py. I suspect the code will become more tightly coupled over time, possibly even moved to merge.py. For now, let's get the code in core.