Make cyclic const

@@ -270,0 +313,4 @@
+    MutableSpan<bool> selection_typed = selection.typed<bool>();
+    return !selection_typed[current] && selection_typed[next];
+  }
+  else if (selection.type().is<float>()) {

@@ -270,0 +346,4 @@
+        if (check_adjacent_selection(selection_curve, point_i, point_i - 1)) {
+          apply_selection_operation_at_index(selection_curve, point_i, SEL_OP_ADD);
+        }
+      }

@@ -199,6 +199,46 @@ static void invert_selection(GMutableSpan selection)
   }
 }
 
+static void apply_selection_operation_at_index(GMutableSpan selection,

@@ -270,0 +323,4 @@
+    threading::parallel_for(curves.curves_range(), 256, [&](const IndexRange range) {
+      for (const int curve_i : range) {
+        MutableSpan<bool> selection_curve = selection_typed.slice(points_by_curve[curve_i]);
+        const int last_i = points_by_curve.size(curve_i) - 1;

@@ -270,0 +340,4 @@
+        }
+
+        /* Handle cyclic curve case. */
+        if (cyclic[curve_i]) {

@@ -270,0 +365,4 @@
+
+        /* Handle all cases in the backwards direction. */
+        for (int point_i = last_i; point_i > 0; point_i--) {
+          if ((selection_typed[point_i] == 0.0f) && (selection_typed[point_i - 1] > 0.0f)) {

@@ -270,0 +272,4 @@
+  const OffsetIndices points_by_curve = curves.points_by_curve();
+  bke::GSpanAttributeWriter selection = ensure_selection_attribute(
+      curves, ATTR_DOMAIN_POINT, CD_PROP_BOOL);
+  VArray<bool> cyclic = curves.cyclic();