A safe mode fix and displayio fixes

* Fixes safe mode on the SAMD51. The "preserved" value was being
clobbered by the bootloader.
* Fixes auto-reload loop when in safe mode.
* Fixes reading Group children with [].
* Check that a TileGrid actually moves before queueing a refresh.

2 files changed, 2 insertions, 2 deletions

diff --git a/shared-module/displayio/Group.c b/shared-module/displayio/Group.c
index adaad1505..b48057d1b 100644
--- a/shared-module/displayio/Group.c
+++ b/shared-module/displayio/Group.c
@@ -98,7 +98,7 @@ size_t common_hal_displayio_group_get_len(displayio_group_t* self) {
 }
 
 mp_obj_t common_hal_displayio_group_get(displayio_group_t* self, size_t index) {
-    return self->children[index];
+    return MP_OBJ_FROM_PTR(self->children[index]);
 }
 
 void common_hal_displayio_group_set(displayio_group_t* self, size_t index, mp_obj_t layer) {
diff --git a/shared-module/displayio/TileGrid.c b/shared-module/displayio/TileGrid.c
index e4f40a5f7..c2aa9b144 100644
--- a/shared-module/displayio/TileGrid.c
+++ b/shared-module/displayio/TileGrid.c
@@ -72,9 +72,9 @@ void common_hal_displayio_tilegrid_get_position(displayio_tilegrid_t *self, int1
 }
 
 void common_hal_displayio_tilegrid_set_position(displayio_tilegrid_t *self, int16_t x, int16_t y) {
+    self->needs_refresh = self->x != x || self->y != y;
     self->x = x;
     self->y = y;
-    self->needs_refresh = true;
 }
 
 mp_obj_t common_hal_displayio_tilegrid_get_pixel_shader(displayio_tilegrid_t *self) {