Limiting git log --graph lane width

The --graph option of git-log(1) draws an ASCII representation of the commit history. In a repository with many active contributors this graph can grow very wide. For example, on the git. git repository this graph grows nine lanes wide after only 30 commits: * 26d8d94e94 A few more topics before -rc2 * 02bb39c5cb Merge branch 'js/objects-larger-than-4gb-on-windows-more' |\ | * c6a4629e32 odb: use size_t for object_info. sizep and the size APIs | * 7a3a78cc76 packfile,delta: drop the `cast_size_t_to_ulong()` wrappers | * 188bac14f7 pack-objects: use size_t for in-core object sizes | * 2d83cc3f84 packfile: widen unpack_entry()'s size out-parameter to size_t | * 1d43315b31 pack-objects(check_pack_inflate()): use size_t instead of unsigned long | * 33afe87338 patch-delta: use size_t for sizes | * 8ea69373a4 compat/msvc: use _chsize_s for ftruncate * | 8cf57cbec4 Merge branch 'kw/gitattributes-typofix' |\ \ | * | 0bf506efd4 gitattributes: fix eol attribute for Perl scripts * | | 8d96f09e92 Merge branch 'js/objects-larger-than-4gb-on-windows' |\ \ \ | * | | ab3810eb6f zlib: properly clamp to uLong * | | | 95e20213fa Hopefully final batch before -rc2 * | | | 8632b5c49d Merge branch 'en/commit-graph-timestamp-fix' |\ \ \ \ | * | | | fbcc5408fc commit-graph: use timestamp_t for max parent generation accumulator * | | | | 619931f561 Merge branch 'dl/posix-unused-warning-clang' |\ \ \ \ \ | * | | | | cf48887610 compat/posix.

h: simplify GIT_GNUC_PREREQ() comparison | * | | | | ffd45926dc compat/posix. h: clean up GIT_GNUC_PREREQ() and UNUSED | * | | | | 689dc92e50 compat/posix.