C-API: improve RichEditor: MaxLengthImpl · Pull Request !68055 · OpenHarmony/arkui_ace_engine

1. improve RichEditor: MaxLengthImpl
---
**IssueNo**: #ICMTUE
**Description**: Need improve RichEditorModifier::MaxLengthImpl
**Sig**: SIG_ApplicationFramework
**Feature or Bugfix**: 需求填Feature
**Binary Source**: No
**是否涉及非兼容变更**: 否
**TDD自验结果(如有失败用例需提供基线执行情况)**: Pass
**XTS自验结果(如有失败用例需提供基线执行情况)**: 不涉及
**检视意见是否都已闭环(无检视意见填是)**: (是/否)

### 是否已执行L0用例
- [x] 已验证
- [ ] 不涉及。如不涉及，请写明理由

| Original | Modified |
| --- | --- |
| "time_stamp": "2025-07-16 18:46:03.656076",| "time_stamp": "2025-07-16 19:20:13.517383",|
| "execute_time": "30.06 seconds",           | "execute_time": "30.06 seconds",           |
| "total_execute_tests": 17421,              | "total_execute_tests": 17421,              |
| "failed_tests_count": 55,                  | "failed_tests_count": 55,                  |
| "disabled_tests_count": 42,                | "disabled_tests_count": 42,                |
| "passed_tests_count": 17324,               | "passed_tests_count": 17324,               |
| "crashed_tests_count": 7,                  | "crashed_tests_count": 7,                  |
| "unavailable": [                           | "unavailable": [                           |
|   "capi_all_modifiers_test",               |   "capi_all_modifiers_test",               |
|   "date_picker_test_ng",                   |   "date_picker_test_ng",                   |
|   "text_clock_test_ng",                    |   "text_clock_test_ng",                    |
|   "xcomponent_test_ng",                    |   "xcomponent_test_ng",                    |
|   "rich_editor_test_ng",                   |   "rich_editor_test_ng",                   |
|   "util_test",                             |   "util_test",                             |
|   "frame_node_test_ng"                     |   "frame_node_test_ng"                     |

类型	指派人员	状态
审查	@ArkUI 由 .gitee/CODEOWNERS 文件第 10 行指派为审查者	进行中 (0/1人)
审查	李俊峰 LiuYongchang caocan ZhangYu xuyue jiangdayuan Caoruihong piggyguy_jdx shiyu_huang jinweiliu jyj_0306 yeyinglong 徐承桦 zhanghaibo yanshuifeng yangfan229 Sunfei 何溯 lushi1202 lixingchi1 王一卉周沺耳 firminly	进行中 (0/1人)
测试	openharmony_ci 已测试通过	已完成 (1/1人)

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