hgweb: explain instabilities of unstable changesets (the rest of the themes)

test-merge-tools: stabilize for Windows See fe5c4b795999.

test-http-protocol: drop an extraneous glob for Windows

merge with stable

hgweb: evaluate the "default" value as template Strictly speaking, everything in the map file is a template. So let's not take out an unparsed template string.

templater: use named function to expand template against mapping dict (API) And replace __call__(t, **mapping) in favor of generate(t, mapping). I prefer a named function here since the templater isn't a simple function-like object. .. api:: The templater is no longer callable. Use ``templater.generate(t, mapping)`` instead of ``templater(t, **pycompat.strkwargs(mapping))``.

highlight: peek Content-Type header set by hgweb There should be no need to re-render the mimetype template since it's set before dispatching webcommands.

obsolete: add a note that explains creating aliases for marker flags

repair: rename _backup to backupbundle A future commit will introduce a caller from outside the module. The function should have already been public because histedit was calling it. Differential Revision: https://phab.mercurial-scm.org/D2666

templatefuncs: do not stringify result of if*() expression Returning a generator means that the result is a byte string. I can't find any reason to make the "if" condition lazy since it is evaluated anyway when {if()} has to be evaluated. So let's simply make if*() return an input expression unmodified.