crecord: add test demonstrating issue when reverting noeol->eol change Differential Revision: https://phab.mercurial-scm.org/D12440

revert: ask user to confirm before tracking new file when interactive If interactively reverting from a commit with `hg revert -i -r`, we would unconditionally add files from that commit that are not already tracked in the working copy. We have prompts for adding back files removed in the working copy, but that's specific to such files and does not apply to adding files from another revision. Differential Revision: https://phab.mercurial-scm.org/D12416

revert: use a `continue` to reduce indentation I'm about to add more code in the block I'm modifying here. Differential Revision: https://phab.mercurial-scm.org/D12415

stringutil: try to avoid running `splitlines()` only to get first line It's wasteful to call `splitlines()` and only get the first line from it. However, Python doesn't seem to provide a built-in way of doing just one split based on the set of bytes used by `splitlines()`. As a workaround, we do an initial split on just LF and then call `splitlines()` on the result. Thanks to Joerg for this suggestion. I didn't bother to also split on CR, so users with old Mac editors (or repos created by such editors) will not get this performance improvement. Differential Revision: https://phab.mercurial-scm.org/D12413

logcmdutil: use new function for getting first line of string Differential Revision: https://phab.mercurial-scm.org/D12412

filemerge: use new function for getting first line of string Differential Revision: https://phab.mercurial-scm.org/D12411