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In the popup & tooltip behaviour, the layers parameter that is passed to the creator of the SelectFeature Control passes an Array, even if there is only 1 layer in that Array.
This patch passes the layers variable as a Layer when there is only 1 layer.
We ran into issues with this using our openlayers_geosearch vector layer + another vector layer with a popup/tooltip behaviour.
With this patch, both layers can have their own SelectFeature Control.