Blender Git Loki

Fix T55745: Pick Shortest Path tool, inconsistent selection.

To get consistent, user-expected results here, we need to 'fake'
starting immediately after a 'skip' block (such that we start with a
full block of selected elements).

Same issue affected vertices and edges selection of course, did not
check the other usages of WM_operator_properties_checker_interval_test()
though.