Home, End, PageUp, PageDown etc on external keyboard do not work
贡献者指南
技术栈
objective c
领域
desktop
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
half day
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
needs investigation
前置要求
macOS developmentObjective C basics
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
20
研究方向
Investigate how MacDown handles key events. The issue likely relates to the NSTextView subclass's keyDown: method not properly passing function keys like Home, End, PageUp, PageDown to the responder chain. Look at the MacDown source code, specifically the editor view files, to see how keyboard events are intercepted. Check if there is a custom key handler that blocks these keys or if the key equivalents are missing. Compare with system level key bindings and consider adding support for external keyboards with different key codes.
