See also #27946 for a related request/question.

The SCM API described here allows you to conditionally add commands to the SCM menus based on the scmProvider and scmResourceGroup, but not based on the scmResourceState.

Conditions on the scmResourceState would be valuable for mercurial extensions (which differentiates between behavior for modified files vs. added files vs. untracked files) without needing to use separate groups for all of them.