interpolateSplineXY inconsistent range handling

Summary

Mesh motion was failing in parallel. Tracked down to interpolating mesh motion (solidBodyFunction used to transform cellCentres) using interpolateSplineXY.

Steps to reproduce

Call interpolateSplineXY with x=0 and X0 starting with 0 element as well.

What is the current bug behaviour?

Out of range access

What is the expected correct behavior?

Returning 0.

Relevant logs and/or images

Environment information

• OpenFOAM version : v2406

Possible fixes

Workaround: make table start with e.g. -1e-10 so 0 is inside range.

Fix: consistent range handling in interpolateXY