FIX: A mesh with overlapping faces cannot be painted

STUDIO-2591

Change-Id: Iad566cdc45d123b5c8342c732c0dc964c261753a
(cherry picked from commit eb9f7297e0ea0557b32e5f59c3a91692ac8afa5b)

src/libslic3r/SLA/IndexedMesh.cpp

@@ -184,10 +184,11 @@ IndexedMesh::query_ray_hits(const Vec3d &s, const Vec3d &dir) const
 
     // Remove duplicates. They sometimes appear, for example when the ray is cast
     // along an axis of a cube due to floating-point approximations in igl (?)
-    hits.erase(std::unique(hits.begin(), hits.end(),
-                           [](const igl::Hit& a, const igl::Hit& b)
-                           { return a.t == b.t; }),
-               hits.end());
+    // BBS: STUDIO-2591 A mesh with overlapping faces cannot be painted
+    //hits.erase(std::unique(hits.begin(), hits.end(),
+    //                       [](const igl::Hit& a, const igl::Hit& b)
+    //                       { return a.t == b.t; }),
+    //           hits.end());
 
     //  Convert the igl::Hit into hit_result
     outs.reserve(hits.size());