fix(refr): flag when all tasks are added to screen layers (#9739)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/core/lv_refr.c

@@ -863,6 +863,7 @@ static void refr_area(const lv_area_t * area_p, int32_t y_offset)
     layer->_clip_area = *area_p;
     layer->phy_clip_area = *area_p;
     layer->partial_y_offset = y_offset;
+    layer->all_tasks_added = false;
 
     if(disp_refr->render_mode == LV_DISPLAY_RENDER_MODE_PARTIAL) {
         /*In partial mode render this area to the buffer*/
@@ -904,6 +905,7 @@ static void refr_area(const lv_area_t * area_p, int32_t y_offset)
 
     if(tile_cnt == 1) {
         refr_configured_layer(layer);
+        layer->all_tasks_added = true;
     }
     else {
         /* Don't draw to the layers buffer of the display but create smaller dummy layers which are using the
@@ -931,6 +933,7 @@ static void refr_area(const lv_area_t * area_p, int32_t y_offset)
             tile_layer->buf_area = layer->buf_area; /*the buffer is still large*/
             tile_layer->draw_buf = layer->draw_buf;
             refr_configured_layer(tile_layer);
+            tile_layer->all_tasks_added = true;
         }
 
 
@@ -955,6 +958,8 @@ static void refr_area(const lv_area_t * area_p, int32_t y_offset)
             if(disp_refr->layer_deinit) disp_refr->layer_deinit(disp_refr, tile_layer);
         }
         lv_free(tile_layers);
+
+        layer->all_tasks_added = true;
     }
 
     disp_refr->refreshed_area = *area_p;

src/draw/lv_draw.c

@@ -424,6 +424,7 @@ void lv_layer_reset(lv_layer_t * layer)
 #endif
     layer->opa = LV_OPA_COVER;
     layer->recolor = lv_color32_make(0, 0, 0, 0);
+    layer->all_tasks_added = false;
 }
 
 lv_layer_t * lv_draw_layer_create(lv_layer_t * parent_layer, lv_color_format_t color_format, const lv_area_t * area)

src/draw/snapshot/lv_snapshot.c

@@ -172,6 +172,8 @@ lv_result_t lv_snapshot_take_to_draw_buf(lv_obj_t * obj, lv_color_format_t cf, l
         }
     }
 
+    layer.all_tasks_added = true;
+
     while(layer.draw_task_head) {
         lv_draw_dispatch_wait_for_request();
         lv_draw_dispatch();

src/widgets/canvas/lv_canvas.c

@@ -411,6 +411,8 @@ void lv_canvas_finish_layer(lv_obj_t * canvas, lv_layer_t * layer)
         return;
     }
 
+    layer->all_tasks_added = true;
+
     bool task_dispatched;
 
     while(layer->draw_task_head) {