branchcache: make entries a private attribute Differential Revision: https://phab.mercurial-scm.org/D6155

branchcache: introduce hasbranch() This will be used to check whether a branch exists or not. This will optimized in future. Differential Revision: https://phab.mercurial-scm.org/D6154

branchmap: drop branchcache.setdefault() (API) All the callers are updated to call setdefault of branchcache.entries Differential Revision: https://phab.mercurial-scm.org/D6153

branchcache: rename itervalues() to iterheads() The itervalues() exists because branchcache() had a dict interface. Since it no longer has a dict interface, it makes sense to have better function names. If a person does not understand how branchcache stores info, it will be hard for them to guess what itervalues() does. Differential Revision: https://phab.mercurial-scm.org/D6152

branchmap: remove the dict interface from the branchcache class (API) The current branchmap computation involves reading the whole branchmap from disk, validating all the nodes even if they are not required. This leads to a lot of time on repos which have large branchmap or a lot of branches. On large repos, this can validate around 1000's of nodes. On some operations, like finding whether a branch exists or not, we don't need to validate all the nodes. Or updating heads for a single branch. Before this patch, branchcache class was having dict interface and it was hard to keep track of reads. This patch removes the dict interface. Upcoming patches will implement lazy loading and validation of data and implement better API's. Differential Revision: https://phab.mercurial-scm.org/D6151

test-template: fix stdio mode on Windows Otherwise, CBOR data would be corrupted. Spotted by Matt Harbison.

samplehgrcs: update the list of suggested extensions Back in the day, this was color and pager, both of which are now default. Churn isn't that popular, but the other four below (obviously?) are.

samplehgrcs: clarify which lines should be uncommented The original wording has confused at least one person. Hopefully it's clearer this way. https://stackoverflow.com/questions/55288177/adding-hg-strip-to-hgrc-config-file