On Tue, 16 Sept 2025 at 10:37, Nyall Dawson <nyall.daw...@gmail.com> wrote:

> Hi list,
>
> While tracking down the failures from
> https://github.com/qgis/QGIS/pull/63180, it's revealed that using QGIS
> with libspatialindex >= 2.0 gives completely misleading results for nearest
> neighbour geometry searches.
>
> The root cause is an optimisation from the upstream library (
> https://github.com/libspatialindex/libspatialindex/commit/6fe9ff769243579ed74f7f27409dd1dda6591634)
> that breaks how downstream clients could previously implement custom
> nearest neighbour comparators. From my research I don't think this is
> fixable in QGIS, and will need an upstream fix.
>

Sorry -- to clarify, that should have been >= 2.1 . 2.0 did not include the
offending commit.

Nyall
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