progress: demonstrate non-linear progress has a bad ETA experience Previously, the ETA and speed assumes the progress is linear. Often, due to network or other issues, it could be fast for the most time, and suddenly slow down: [====================================================> ] \___________________________________________/\______/ very fast suddenly much slower This patch adds a test demonstrating the ETA could be way off in those cases. Differential Revision: https://phab.mercurial-scm.org/D819

copytrace: add a a new config to limit the number of drafts in heuristics The heuristics options tries to the default full copytracing algorithm if both the source and destination branches contains of non-public changesets only. But this can be slow in cases when we have a lot of drafts. This patch adds a new config option experimental.copytrace.sourcecommitlimit which defaults to 100. This value will be the limit of number of drafts from c1 to base. Incase there are more changesets even though they are draft, the heuristics algorithm will be used. Differential Revision: https://phab.mercurial-scm.org/D763

mail: encode long unicode lines in emails properly (issue5687) 3e544c074459 introduced a bug: emails Content-Transfer-Encoding is silently replaced with 'quoted-printable' while any other encoding could be used by underlying code. The problem is revealed when a long unicode line is encoded. The patch implements proper check which works for any text and encoding.

chg: show timestamp with debug messages Like `strace -tr`, this helps finding performance bottlenecks. Differential Revision: https://phab.mercurial-scm.org/D807

keepalive: add more context to bad status line errors As the TODO in the test said, the previous error message was not very helpful. Let's improve things. Differential Revision: https://phab.mercurial-scm.org/D811

tests: add interface checks for bundle, statichttp, and union peers I forgot to add these when I initially wrote the test. They inherit from localrepo.localpeer, so they should be explicitly tested. Differential Revision: https://phab.mercurial-scm.org/D810

alias: make alias command lazily resolved With many aliases, resolving them could have some visible overhead. Below is part of traceprof [1] output of `hg bookmark --hidden`: (time unit: ms) 37 \ addaliases dispatch.py:526 37 | __init__ (60 times) dispatch.py:402 33 | findcmd (108 times) cmdutil.py:721 16 | findpossible (49 times) cmdutil.py:683 It may get better by optimizing `findcmd` to do a bisect, but we don't really need to resolve an alias if it's not used, so let's make those command entries lazy. After this patch, `addalias` takes less than 1ms. .. perf:: improved performance when many aliases are defined [1]: https://bitbucket.org/facebook/hg-experimental/src/9aca0dbdbdfc48457e5d2581ca2d6e662fced2e6/hgext3rd/traceprof.pyx Differential Revision: https://phab.mercurial-scm.org/D805