Copy knob_area to ext
@@ -403,6 +403,8 @@ static void draw_knob(lv_obj_t * rotary, const lv_area_t * clip_area)
lv_coord_t center_y = rotary->coords.y1 + r + top_bg;
lv_coord_t knob_inner = lv_obj_get_style_pad_inner(rotary, LV_ROTARY_PART_KNOB);
+ lv_rotary_ext_t * ext = lv_obj_get_ext_attr(rotary);
+
if(r > 0) {
knob_area.x1 = center_x - r + indic_width + knob_inner;
knob_area.x2 = center_x + r - indic_width - knob_inner;
