[PATCH 0/3] Change "--diff-merges" to require parameter

These patches present a minimal set of changes to turn --diff-merges
to require parameter. For now we only introduce --diff-merges=off as
synonym for --no-diff-merges.

These are on top of jk/log-fp-implies-m "making --first-parent imply -m"
by Jeff King, that introduced --[no-]diff-merges as a boolean option to
provide ability to override implied -m by --no-diff-merges.

Sergey Organov (3):
  revision: change "--diff-merges" option to require parameter
  doc/git-log: describe --diff-merges=off
  t/t4013: add test for --diff-merges=off

 Documentation/git-log.txt                     |  6 +-
 revision.c                                    |  9 ++-
 t/t4013-diff-various.sh                       |  1 +
 ...--diff-merges=off_-p_--first-parent_master | 78 +++++++++++++++++++
 4 files changed, 92 insertions(+), 2 deletions(-)
 create mode 100644 t/t4013/diff.log_--diff-merges=off_-p_--first-parent_master

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2.20.1