arc and preloader draw and design fixes

src/lv_draw/lv_draw_arc.c

@@ -54,6 +54,7 @@ void lv_draw_arc(lv_coord_t center_x, lv_coord_t center_y, uint16_t radius, cons
     circle_style.body.opa = LV_OPA_TRANSP;
     circle_style.body.border.width = style->line.width;
     circle_style.body.border.color = style->line.color;
+    circle_style.body.border.opa = style->line.opa;
 
     lv_draw_mask_angle_param_t mask_angle_param;
     lv_draw_mask_angle_init(&mask_angle_param, center_x, center_y, start_angle, end_angle);

src/lv_draw/lv_draw_blend.c

@@ -326,6 +326,7 @@ static void fill_normal(const lv_area_t * disp_area, lv_color_t * disp_buf,  con
                         {
                             if(mask_tmp[x] > LV_OPA_MAX) last_res_color = color;
                             else if(mask_tmp[x] < LV_OPA_MIN) last_res_color = disp_buf_tmp[x];
+                            else if(disp_buf_tmp[x].full == color.full) last_res_color = color;
                             else last_res_color = lv_color_mix(color, disp_buf_tmp[x], mask_tmp[x]);
                         }
                         last_mask = mask_tmp[x];

src/lv_objx/lv_preload.c

@@ -359,7 +359,8 @@ void lv_preload_spinner_anim(void * ptr, lv_anim_value_t val)
     angle_start = angle_start % 360;
     angle_end   = angle_end % 360;
 
-    lv_arc_set_angles(preload, angle_start, angle_end);
+    lv_arc_set_start_angle(preload, angle_start);
+    lv_arc_set_end_angle(preload, angle_end);
 }
 
 /**********************
@@ -400,6 +401,7 @@ static lv_design_res_t lv_preload_design(lv_obj_t * preload, const lv_area_t * c
             bg_style.body.radius       = LV_RADIUS_CIRCLE;
             bg_style.body.border.color = style->body.border.color;
             bg_style.body.border.width = style->body.border.width;
+            bg_style.body.border.opa = style->body.border.opa;
 
             lv_area_t bg_area;
             bg_area.x1 = x - r;