* include/abg-diff-utils.h (point::{operator!=,operator==}): New
operators.
(end_of_fr_d_path_in_k, end_of_frr_d_path_in_k_plus_delta): Allow
the initial point (-1,-1) that is not a point addressing elements
of the input sequences, but that is the starting point of the
forward paths and the ending point of reverse paths in the "Linear
Refinement" of the algorithm.
(is_match_point, maybe_record_match_point)
(find_snake_start_point): New functions.
(find_last_snake_in_path): Remove this. It's not used anymore.
(compute_middle_snake): Allow checking for overlapping paths even
on points that are outside of the edit graph boundaries. Once the
overlap is detected, if a non-empty snake has been seen already,
report it as the middle snake. Otherwise, keep building the path
until the end and report the last snake encountered as the middle
snake. Add comments.
(compute_diff): For the d == 1 case, fix the logic of the finding
the non-diagonal edge. Fix typos. Add comments.
(display_edit_script): Fix report glitches.
* tests/data/test-core-diff/report3.txt: Update as per the report
glitch above.
* tests/data/test-core-diff/report4.txt: Likewise.
* tests/data/test-core-diff/report5.txt: Likewise.
* tests/data/test-core-diff/report6.txt: New reference report for
a new test.
* tests/test-core-diff.cc: Add a new test for negative delta.
Signed-off-by: Dodji Seketeli <dodji@redhat.com>
