当我在 TextField 中输入类似“aA”的字符串时，当我输入大写字母时会发生异常，但是应用程序不会崩溃。
这是我的例外：
════════ 服务库捕获的异常═════════════════════════════␐═══════════在平台消息回调期间抛出：当 keysPressed 中没有键时，尝试发送按键按下事件。如果正在发送的键事件未正确设置其修饰符标志，则可能会出现此状态。这是事件： RawKeyDownEvent#67162(logicalKey: LogicalKeyboardKey#70039(keyId: "0x100070039", keyLabel: "Caps Lock", debugName: "Caps Lock"), physicalKey: PhysicalKeyboardKey#70039(usbHidUsage: "0x00070039", debugName: "Caps Lock")) 及其数据： RawKeyEventDataAndroid(keyLabel: flags: 8, codePoint: 0, keyCode: 115, scanCode: 58, metaState: 0, modifiers down: {}) 'package:flutter/src/services/raw_keyboard .dart'：断言失败：第 666 行 pos 7：'事件是！RawKeyDownEvent || _keysPressed.isNotEmpty'