copies: inline _computenonoverlap() in mergecopies() We now call pathcopies() from the base to each of the commits, and that calls _computeforwardmissing(), which does file prefetching (in the remotefilelog override). So the call to _computenonoverlap() is now pointless (the sets of files from _computenonoverlap() are subsets of the sets of files from _computeforwardmissing()). This somehow also fixes a broken remotefilelog test. Differential Revision: https://phab.mercurial-scm.org/D6256