scratch/undo-apply updated (ae89b15a0ad -> 1273c1759e1)

ellerh pushed a change to branch scratch/undo-apply.

      from  ae89b15a0ad Document the new undo-list entry kind
       new  4fa4a8dde14 Make undo-in-region more cautious
       new  1273c1759e1 Make handling of partially selected undo items customizable


Summary of changes:
 lisp/simple.el                  | 105 +++++++++++++++++++++++++++++++---------
 test/lisp/simple-tests.el       |  12 ++++-
 test/lisp/vc/diff-mode-tests.el |   3 +-
 test/src/undo-tests.el          |  79 ++++++++++++++++++++++++++++--
 4 files changed, 170 insertions(+), 29 deletions(-)