fix(esp_lvgl_port): Fix task delay calculation for LVGL9

vTaskDelay(1) in the task loop should be taken into account.

Author: Trigger239

components/esp_lvgl_port/CHANGELOG.md

@@ -6,6 +6,9 @@
 - Added display flush wait callback support
 - Added support for buffered LCD panel (esp_lcd_buffered)
 
+### Fixes
+- Fixed LVGL9 task delay calculation
+
 ## 2.6.2
 
 - Changed minimum IDF version to IDF5.1

components/esp_lvgl_port/src/lvgl9/esp_lvgl_port.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2024-2025 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2024-2026 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -271,8 +271,14 @@ static void lvgl_port_task(void *arg)
             task_delay_ms = lvgl_port_ctx.task_max_sleep_ms;
         }
 
-        /* Minimal dealy for the task. When there is too much events, it takes time for other tasks and interrupts. */
+        /* Minimal delay for the task. When there is too much events, it takes time for other tasks and interrupts. */
         vTaskDelay(1);
+        /* Adjust delay value returned by lv_timer_handler() accordingly */
+        if (task_delay_ms >= portTICK_PERIOD_MS) {
+            task_delay_ms -= portTICK_PERIOD_MS;
+        } else {
+            task_delay_ms = 0;
+        }
     }
 
     /* Give semaphore back */