GPv3: Delete operator

This was required because of #114283

@@ -561,0 +579,4 @@
+    {0, nullptr, 0, nullptr, nullptr},
+};
+
+static bke::CurvesGeometry delete_points(const bke::CurvesGeometry &curves,

@@ -561,0 +579,4 @@
+    {0, nullptr, 0, nullptr, nullptr},
+};
+
+static bke::CurvesGeometry remove_points_and_split(const bke::CurvesGeometry &curves,

@@ -561,0 +562,4 @@
+/** \name Delete Operator
+ * \{ */
+
+enum class DeleteMode {

@@ -561,0 +688,4 @@
+
+  bool changed = false;
+  grease_pencil.foreach_editable_drawing(
+      scene->r.cfra, [&](int /*drawing_index*/, bke::greasepencil::Drawing &drawing) {

@@ -564,0 +566,4 @@
+ * \{ */
+
+static bke::CurvesGeometry remove_points_and_split(const bke::CurvesGeometry &curves,
+                                                   const VArray<bool> selection)

@@ -564,0 +570,4 @@
+{
+  const OffsetIndices<int> points_by_curve = curves.points_by_curve();
+  const VArray<bool> src_cyclic = curves.cyclic();
+  const Span<bool> points_to_delete = selection.get_internal_span();

@@ -564,0 +595,4 @@
+    IndexRange first_range = ranges_to_keep.first().shift(points.first());
+    IndexRange last_range = ranges_to_keep.last().shift(points.first());
+
+    const bool is_last_segment_selected = first_range.first() == points.first() &&

@@ -564,0 +601,4 @@
+    const bool is_cyclic = ranges_to_keep.size() == 1 && is_last_segment_selected;
+
+    IndexRange range_ids = ranges_to_keep.index_range();
+    for (const int range_id : range_ids) {

@@ -564,0 +676,4 @@
+  grease_pencil.foreach_editable_drawing(
+      scene->r.cfra, [&](int /*layer_index*/, bke::greasepencil::Drawing &drawing) {
+        bke::CurvesGeometry &curves = drawing.strokes_for_write();
+        if (curves.points_num() == 0) {

@@ -564,0 +688,4 @@
+          blender::ed::curves::select_linked(curves);
+        }
+
+        const VArray<bool> selection = *curves.attributes().lookup_or_default<bool>(

@@ -564,0 +714,4 @@
+  /* Identifiers. */
+  ot->name = "Delete";
+  ot->idname = "GREASE_PENCIL_OT_delete";
+  ot->description = "Delete selected Grease Pencil strokes or points";

@@ -564,0 +641,4 @@
+  const bke::AttributeAccessor src_attributes = curves.attributes();
+
+  /* Transfer curve attributes. */
+  for (bke::AttributeTransferData &attribute : bke::retrieve_attributes_for_transfer(

@@ -564,0 +651,4 @@
+  array_utils::copy(dst_cyclic.as_span(), dst_curves.cyclic_for_write());
+
+  /* Transfer point attributes. */
+  for (bke::AttributeTransferData &attribute : bke::retrieve_attributes_for_transfer(