- fix compilation error with DEBUG 1, after moving patience state out of diff_atom, and after renaming diff_data.d to diff_data.root. - add some missing newlines. - also debug "HIT" on a max-effort cut, like when finding a mid snake, which eases finding all the places where boxes get cut.

Thread 1 received signal SIGSEGV, Segmentation fault. 0x0000013992a89eca in diff_data_atomize_text_lines_mmap (d=0x13b9b455668) \ at /home/stsp/src/got/got/../lib/diff_atomize_text.c:134 134 if (line_end[0] == '\r' (gdb) p pos $1 = (const uint8_t *) 0x13be402006d "" (gdb) p end $2 = (const uint8_t *) 0x13be4023000 <error: Cannot access memory at \ address 0x13be4023000> (gdb) p end-1 $3 = (const uint8_t *) 0x13be4022fff "" (gdb) p line_end $4 = (const uint8_t *) 0x13be4023000 <error: Cannot access memory at \ address 0x13be4023000>

Cast ARRAYLIST_IDX result to unsigned long and use %lu in the format string. Clang 10.0.1 complained as follows: results_test.c:148:9: warning: format specifies type 'int' but the argument has type 'long' [-Wformat] ARRAYLIST_IDX(c, result->chunks), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Use explicit casts to long long and use %lld in the format string. Clang 10.0.1 complained as follows: results_test.c:78:9: warning: format specifies type 'int' but the argument has type 'long long' [-Wformat] c->left_start ? c->left_start->pos : -1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

ARRAYLIST_IDX deals with the head pointer. Explicitly cast to unsigned long and use %lu in the format string. Clang 10.0.1 used to complain as follows: arraylist_test.c:19:2: warning: format specifies type 'int' but the argument has type 'long' [-Wformat] arraylist_test.c:15:24: note: expanded from macro 'dump' printf("[%d] %d\n", ARRAYLIST_IDX(p, list), *p); \ ~~ ^~~~~~~~~~~~~~~~~~~~~~

They will be needed to implement 'got stage -p' and 'got revert -p', etc. Chunks stored in diff_result still need post-processing in order to be displayed as expected by diff_output_unidiff_chunk(). Exposing these functions allows API consumers to implement the same chunk merging loop as used internally by output_unidiff() and output_edscript(). (Perhaps, ideally, the public diff API would provide pre-merged chunks at some point in the future? Then this commit could probably be reverted.) Change return values from bool to int to avoid making stdbool.h a requirement for the public diff API.

Fixes test failures on OpenBSD due to unstable results of qsort if two or more elements are equal. Add a compat copy of OpenBSD mergesort(3) for Linux.

Not adding new tests since this behaviour is covered by tests in Got.