Merge branch 'jk/blame-coalesce-fix'

When given more than one target line ranges, "git blame -La,b -Lc,d" was over-eager to coalesce groups of original lines and showed incorrect results, which has been corrected. * jk/blame-coalesce-fix: blame: only coalesce lines that are adjacent in result t8003: factor setup out of coalesce test t8003: check output of coalesced blame