Created attachment 117680 [details] Test case Zero-length subpaths with square or round linecaps should have linecaps drawns, and they are. Markers, if defined, should also be drawn for such paths, with a start marker and a end marker and no mid markers. Currently, no markers at all are drawn with such linecaps.
Niko says the test passes with his patch for 86392. I'll verify once that's in.
r117971 fixed this - included the testcase from this bug report.