context: use `dirstate.set_tracked` in context.copy This is the new shiny API. Differential Revision: https://phab.mercurial-scm.org/D11015

context: use `dirstate.set_tracked` in `context.add` This is the new shiny API. Differential Revision: https://phab.mercurial-scm.org/D11014

dirstate: add a `set_tracked` method for "hg add"-like usage This is a step further toward clarifying the semantic of various dirstate call. Having a dedicated function comes with a couple of benefits: 1) we can move duplicated logic about how to handle the previous state within the dirstate. Since we are sure this is always called in the same situation, we can implement that logic once in the dirstate. 2) having a dedicated method for this case unlock also having a dedicated method for the other case and recording more information at that time. All this leading having more code within the dirstate and higher level API that are less error prone. Differential Revision: https://phab.mercurial-scm.org/D11013

dirstate: add a function to update tracking status while "moving" parents The `scmutil.dirstateparent` is moving the dirstate parent without touching the working copy. It is used by history-rewriting operations like amending of folding. The function was directly doing the "low level" computation and dirstate change. All that logic belong to the dirstate and should be moved there. For this purpose we introduce a new function that does just that and use it. Differential Revision: https://phab.mercurial-scm.org/D11012