Fix vectorio in group tracking

shared-bindings/vectorio/VectorShape.c

@@ -82,6 +82,7 @@ vectorio_draw_protocol_impl_t vectorio_vector_shape_draw_protocol_impl = {
     .draw_finish_refresh = (draw_finish_refresh_fun)vectorio_vector_shape_finish_refresh,
     .draw_get_refresh_areas = (draw_get_refresh_areas_fun)vectorio_vector_shape_get_refresh_areas,
     .draw_set_dirty = (draw_set_dirty_fun)common_hal_vectorio_vector_shape_set_dirty,
+    .draw_set_in_group = (draw_set_in_group_fun)vectorio_vector_shape_set_in_group,
 };
 
 // Stub checker does not approve of these shared properties.

shared-bindings/vectorio/VectorShape.h

@@ -43,6 +43,7 @@ mp_obj_t common_hal_vectorio_vector_shape_get_pixel_shader(vectorio_vector_shape
 void common_hal_vectorio_vector_shape_set_pixel_shader(vectorio_vector_shape_t *self, mp_obj_t pixel_shader);
 
 void vectorio_vector_shape_update_transform(vectorio_vector_shape_t *self, displayio_buffer_transform_t *group_transform);
+bool vectorio_vector_shape_set_in_group(vectorio_vector_shape_t *self, bool in_group);
 
 // Composable property definition for shapes that use VectorShape
 extern vectorio_draw_protocol_impl_t vectorio_vector_shape_draw_protocol_impl;

shared-bindings/vectorio/__init__.h

@@ -23,6 +23,7 @@ typedef bool (*draw_get_dirty_area_fun)(mp_obj_t draw_protocol_self, displayio_a
 typedef void (*draw_update_transform_fun)(mp_obj_t draw_protocol_self, displayio_buffer_transform_t *group_transform);
 typedef void (*draw_finish_refresh_fun)(mp_obj_t draw_protocol_self);
 typedef void (*draw_set_dirty_fun)(mp_obj_t draw_protocol_self);
+typedef bool (*draw_set_in_group_fun)(mp_obj_t draw_protocol_self, bool in_group);
 typedef displayio_area_t *(*draw_get_refresh_areas_fun)(mp_obj_t draw_protocol_self, displayio_area_t *tail);
 
 typedef struct _vectorio_draw_protocol_impl_t {
@@ -32,6 +33,7 @@ typedef struct _vectorio_draw_protocol_impl_t {
     draw_finish_refresh_fun draw_finish_refresh;
     draw_get_refresh_areas_fun draw_get_refresh_areas;
     draw_set_dirty_fun draw_set_dirty;
+    draw_set_in_group_fun draw_set_in_group;
 } vectorio_draw_protocol_impl_t;
 
 // Draw protocol

shared-module/displayio/Group.c

@@ -251,7 +251,11 @@ static void _add_layer(displayio_group_t *self, mp_obj_t layer) {
     #if CIRCUITPY_VECTORIO
     const vectorio_draw_protocol_t *draw_protocol = mp_proto_get(MP_QSTR_protocol_draw, layer);
     if (draw_protocol != NULL) {
-        draw_protocol->draw_protocol_impl->draw_update_transform(draw_protocol->draw_get_protocol_self(layer), &self->absolute_transform);
+        mp_obj_t protocol_self = draw_protocol->draw_get_protocol_self(layer);
+        if (draw_protocol->draw_protocol_impl->draw_set_in_group(protocol_self, true)) {
+            mp_raise_ValueError(MP_ERROR_TEXT("Layer already in a group"));
+        }
+        draw_protocol->draw_protocol_impl->draw_update_transform(protocol_self, &self->absolute_transform);
         return;
     }
     #endif
@@ -296,6 +300,7 @@ static void _remove_layer(displayio_group_t *self, size_t index) {
         bool has_dirty_area = draw_protocol->draw_protocol_impl->draw_get_dirty_area(layer, &layer_area);
         rendered_last_frame = has_dirty_area;
         draw_protocol->draw_protocol_impl->draw_update_transform(layer, NULL);
+        draw_protocol->draw_protocol_impl->draw_set_in_group(layer, false);
     }
     #endif
     layer = mp_obj_cast_to_native_base(

shared-module/vectorio/VectorShape.c

@@ -555,3 +555,9 @@ void vectorio_vector_shape_update_transform(vectorio_vector_shape_t *self, displ
     self->absolute_transform = group_transform == NULL ? &null_transform : group_transform;
     common_hal_vectorio_vector_shape_set_dirty(self);
 }
+
+bool vectorio_vector_shape_set_in_group(vectorio_vector_shape_t *self, bool in_group) {
+    bool was_in_group = self->in_group;
+    self->in_group = in_group;
+    return was_in_group;
+}

shared-module/vectorio/VectorShape.h

@@ -43,6 +43,7 @@ typedef struct {
     displayio_area_t current_area;
     bool current_area_dirty;
     bool hidden;
+    bool in_group;
 } vectorio_vector_shape_t;
 
 displayio_area_t *vectorio_vector_shape_get_refresh_areas(vectorio_vector_shape_t *self, displayio_area_t *tail);