Because selection was deactivated in layout, selection color was not transmitted from QgsProject to QgsLayoutRenderContext to QgsMapSettings.
forward porting of #7294
The capability to print selection has been removed by the commit aaa7003 to
prevent accidental selections showing in exports from composer.
It is reactivated only for QGIS Server.
Fixes#13459 QGIS Server WMS GetPrint request don't respect SELECTION parameter
It's a forward porting of #7185
Checks whether a function declaration has parameters that are
top level const.
const values in declarations do not affect the signature of a
function, so they should not be put there.
