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Ctrl+right click often selects the wrong vertex when done immediately after extruding
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Description

System Information
Ubuntu, 64-bit, Nvidia graphics card (not sure of exact version)

Blender Version
2.78c

Short description of error
If you extrude a new vertex with ctrl+click or 'e', then ctrl+right click on another vertex (which should select the shortest path between the vertices), the wrong vertex will often be chosen as the end of the path.

Exact steps for others to reproduce the error


Open the attached .blend file, switch to edit mode, select only the top-left vertex, ctrl+click somewhere on the left to create a fifth vertex, ctrl+right click on the vertex on the bottom-left of the quad. This should select the shortest path from the new vertex to the bottom-left vertex, but instead it selects a path to the bottom-right vertex. This is reproducible every time, as long as nothing is done in between any of the steps.

Revisions and Commits

Event Timeline

It's strange that any minimal change in 3DView, the bug is no longer reproducible.
@Nathan Stoddard (nstoddard), how to get to this situation from the default Cube?

@Campbell Barton (campbellbarton), recently you worked on the selection code, it may not be related but... could you take a look?

This is reproducible with every mesh I've tried, including the default cube.

Aaron Carlisle (Blendify) lowered the priority of this task from 90 to Normal.