Nested paths that were neither generating a new hole or a new filling resulted in double filling of some areas. The previous workaround was to force the intersectionSolver to generate a new path, however, which is computational expensive and does not allow to check for changes. This patch introduces a dedicated function to remove superfluos nested subpaths. It should be faster than the previous solution and allows to track changes to the path. With this patch, the intersectionSolver returns true only if the path was changed. Pick-to: 6.7 Change-Id: I16919f20b4e5460ddd729e8be7703fb2879c3190 Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>