[core] Replace FeatureIndex::collisionTile with a method parameter

This reduces state and simplifies the test added in the prior commit.

2 files changed, 2 insertions, 2 deletions

diff --git a/src/mbgl/text/collision_tile.cpp b/src/mbgl/text/collision_tile.cpp
index 419ab31a79..368750c89f 100644
--- a/src/mbgl/text/collision_tile.cpp
+++ b/src/mbgl/text/collision_tile.cpp
@@ -168,7 +168,7 @@ Box CollisionTile::getTreeBox(const Point<float>& anchor, const CollisionBox& bo
     };
 }
 
-std::vector<IndexedSubfeature> CollisionTile::queryRenderedSymbols(const GeometryCoordinates& queryGeometry, float scale) {
+std::vector<IndexedSubfeature> CollisionTile::queryRenderedSymbols(const GeometryCoordinates& queryGeometry, float scale) const {
     std::vector<IndexedSubfeature> result;
     if (queryGeometry.empty() || (tree.empty() && ignoredTree.empty())) {
         return result;
diff --git a/src/mbgl/text/collision_tile.hpp b/src/mbgl/text/collision_tile.hpp
index 186cd19d28..ea4324edaf 100644
--- a/src/mbgl/text/collision_tile.hpp
+++ b/src/mbgl/text/collision_tile.hpp
@@ -42,7 +42,7 @@ public:
     float placeFeature(const CollisionFeature&, bool allowOverlap, bool avoidEdges);
     void insertFeature(CollisionFeature&, float minPlacementScale, bool ignorePlacement);
 
-    std::vector<IndexedSubfeature> queryRenderedSymbols(const GeometryCoordinates&, float scale);
+    std::vector<IndexedSubfeature> queryRenderedSymbols(const GeometryCoordinates&, float scale) const;
 
     const PlacementConfig config;