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
absorb: use new function for getting first line of string
Differential Revision: https://phab.mercurial-scm.org/D12410
extensions: use new function for getting first line of string
Differential Revision: https://phab.mercurial-scm.org/D12409
bookmarks: use new function for getting first line of string
Differential Revision: https://phab.mercurial-scm.org/D12408
help: use new function for getting first line of string
Differential Revision: https://phab.mercurial-scm.org/D12407
histedit: remove an unnecessary default value of `b''` for commit message
I don't think `ctx.description()` is ever anything falsy other than
`b''`. I think the comment added in
4c4232e51167 (histedit: extract
common summary code into method, 2016-05-27) is mistaken (I don't see
any code following that pattern before the function was added).
Differential Revision: https://phab.mercurial-scm.org/D12406