Merge branch 'rs/pickaxe-i'

Allow the options -i/--regexp-ignore-case, --pickaxe-regex, and -S to be used together and work as expected to perform a pickaxe search using case-insensitive regular expression matching. * rs/pickaxe-i: pickaxe: simplify kwset loop in contains() pickaxe: call strlen only when necessary in diffcore_pickaxe_count() pickaxe: move pickaxe() after pickaxe_match() pickaxe: merge diffcore_pickaxe_grep() and diffcore_pickaxe_count() into diffcore_pickaxe() pickaxe: honor -i when used with -S and --pickaxe-regex t4209: use helper functions to test --author t4209: use helper functions to test --grep t4209: factor out helper function test_log_icase() t4209: factor out helper function test_log() t4209: set up expectations up front