light: hack to fix lights exactly on faces

light/ltface.c

@@ -1159,6 +1159,9 @@ LightFace_Entity(const entity_t *entity, const lightsample_t *light,
             }
         }
         
+        /* HACK: support lights lying exactly on a face by only tracing up to 0.1 units from the light */
+        dist = qmax(0.0f, dist - 0.1f);
+
         if (!TestLight_embree(surfpoint, ray, dist, modelinfo))
             continue;