fileset: add function to switch revision where fileset will be evaluated If the subset isn't filtered yet, i.e. if fullmatchctx, the new subset is recalculated from scratch. Otherwise, it is narrowed by the existing subset.

fileset: extract function that builds status tuple only if necessary This function will be used to recalculate status when mctx.ctx is switched.

fileset: build initial subset in fullmatchctx class

fileset: extract function that builds initial subset from ctx or status This function will be used to recalculate subset when mctx.ctx is switched.

fileset: add class to host special handling of initial subset Future patches will add a function to switch mctx.ctx object so that we can forcibly evaluate a fileset expression in a specified revision. For example, new "revs()" function will be used to match predicate agains another revision $ hg revert 'set:revs(42, added())' fullmatchctx class is similar to revset.fullreposet. It will allow us to recalculate the subset only if it is not filtered yet.

patchbomb: add config knob to generate flags by template (issue5354) This can be used to flag patches by branch or topic automatically. Flags optionally given by --flag option are exported as {flags} template keyword, so you can add --flag V2.