D2400: stack: begin to make the stack revset configurable

[lothiraldan (Boris Feld)]

lothiraldan added a comment.


  The goal of this series is to define a clean API so that commands and tools can be built in a stack-definition agnostic way. It's not to define a one-size-fits-all stack definition.
  
  People and companies have different workflows and needs. Their definition of a stack will likely to be different to better match their workflow. I tried finding a way to configure stack as easily as possible. I have the impression that using configuration options is slightly easier than defining a custom extension. I also avoided using directly a revset from the configuration file as I'm not sure it would be the best way to express all situations.
  
  I don't know if the config options best place are in the `stack` section though.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D2400

To: lothiraldan, #hg-reviewers, indygreg
Cc: indygreg, mercurial-devel