Merge branch 'mm/line-log-limited-ops' into seen

Merge branch 'mm/line-log-limited-ops' into seen

The 'git log -L<range>:<path>' command has been taught to limit
various 'diff' operations, such as '--stat', '--check', and '-G', to
the specified range and path.

* mm/line-log-limited-ops:
  diffcore-pickaxe: scope -G to the -L tracked range
  diff: support --check with -L line ranges
  line-log: support diff stat formats with -L
  diff: extract a line-range diff helper for reuse
  diff: emit -L hunk headers via xdiff's formatter
  diff: simplify the line-range filter by classifying removals immediately
  diff: rename and group the line-range filter for clarity