highlight: add option to prevent content-only based fallback When Mozilla enabled Pygments on hg.mozilla.org, we got a lot of weirdly colorized files. Upon further investigation, the hightlight extension is first attempting a filename+content based match then falling back to a purely content-driven detection mode in Pygments. Sounds good in theory. Unfortunately, Pygments' content-driven detection establishes no minimum threshold for returning a lexer. Furthermore, the detection code for a number of languages is very liberal. For example, ActionScript 3 will return a confidence of 0.3 (out of 1.0) if the first 1k of the file we pass in matches the regex "\w+\s*:\s*\w"! Python matches on "import ". It's no coincidence that a number of our extension-less files were getting highlighted improperly. This patch adds an option to have the highlighter not fall back to purely content-based detection when filename+content detection failed. This can be enabled to render unlighted text instead of taking the risk that unknown file types are highlighted incorrectly. The old behavior is still the default.

highlight: inline checkfctx() It is only used once. pygmentize() is pretty small. Let's just inline it.

highlight: consolidate duplicate code I'm adding some logic in a future patch and this will make it so I only have to add it once.

rebase: properly abort when destination is public (issue4896) After rebasing a set of changes onto a public changeset and having the first one be skipped, if you try to abort, the operation fails. This fix adds a check to disallow the target rev into the dstates list within the abort function. This list is checked for immutable states before the rest of abort does its thing.

bookmarks: don't deactivate on no-op update (issue4901)

rebase: properly handle chains of markers with missing nodes As obsolescence markers can contains unknown nodes and 'allsuccessors' returns them, we have to protect again that when looking for successors of the rebase set in the destination. Test have been expanded to catch that.

rebase: use a direct reference to repo.changelog Accessing 'repo.changelog' have a small overhead because we double check that the filtering did not changed. As we make multiple use of this into loops, we should avoid doing the lookup/check every time. This also make the code tidier.

mail: drop python 2.5 support

exchange: use pushop.repo instead of repo

rebase: factor out nothing to rebase return code A rebase call that results in nothing to rebase might be considered successful in some contexts. This factors out the return code from places where hg determines that there is nothing to rebase, so an extenion might change this return code to be something that would allow scripts to run without seeing this as an error.