templates: add __init__.py files to templates/ dirs This is necessary for them to be loaded with `importlib.resources`, which we want to do for PyOxidizer and similar. `importlib.resources` cannot read resources from submodules (`resources.open_binary('mercurial.templates', 'coal/map')` is not valid), so we need one `__init__.py` per directory. Differential Revision: https://phab.mercurial-scm.org/D8854

merge with stable

localrepo: abort creating a shared repo if the source does not have store We cannot create a shared repository without a store IIUC. Let's abort in such cases. Differential Revision: https://phab.mercurial-scm.org/D8772

localrepo: only use 'bookmarksinstore' requirement if we have 'store' This adds check that whether we have the 'store' requirement or not. If we don't have that, we skip adding the 'bookmarksinstore' requirement and warn user about it. Differential Revision: https://phab.mercurial-scm.org/D8771

mergeresult: make actionmapping a dict of dict instead of dict of lists This makes deleting a specific filename entry faster and easier. Differential Revision: https://phab.mercurial-scm.org/D8837

largefiles: introduce a constant for 'lfmr' action It's better to use a dedicated constant instead of a string which makes pretty less sense. Differential Revision: https://phab.mercurial-scm.org/D8836

largefiles: override merge.emptyactions() to include `lfmr` I found it weird that we were not already doing this. I encountered this while using `emptyactions()` in mergeresult() class. Differential Revision: https://phab.mercurial-scm.org/D8835

merge: unify logic of couple of if-else's in manifestmerge() Right now manifestmerge() contains very nested if-else conditions and it's not easy to understand what is happening. I was looking for easy unifications and found these two. Differential Revision: https://phab.mercurial-scm.org/D8834

sparse: add comment for an if condition which I tried to refactor I tried to refactor this if condition and make it part of the if-else above but tests failed. I decided to add a comment about the check we are doing and why it's a separate if. Differential Revision: https://phab.mercurial-scm.org/D8833

mergeactions: use action constants instead of string values Having constants inplace of strings like 'c', 'cm' etc. makes it easier to understand the code. Differential Revision: https://phab.mercurial-scm.org/D8832

merge: use the new action based mapping introduced in mergeresult obj Before this patch, we have good number of instances of following types: ``` for f, (m, args, msg) in mresult.actions: if m == ACTION_X: do_something ``` We iterate over the whole list and then filter for a certain action. Previous patch introduced a action based mapping in mergeresult object. The above code now looks like: ``` for f, args, msg in mresult.getactions([ACTION_X, ...]): do_something ``` Differential Revision: https://phab.mercurial-scm.org/D8831

mergeresult: introduce action -> (filename, data, msg) mapping and related API Good number of places in code, we iterate over the actions dict which has filename as keys and filter based on the action. This patch introduced another mapping which has action as key. This will help in refactoring the code much more in upcoming patch. Differential Revision: https://phab.mercurial-scm.org/D8830