Android 有没有办法修复文本上方的泪珠滑块？

我对文本字段中选定文本的滑块有一个奇怪的问题，如下图所示，它只出现在这个屏幕上，而不出现在其他屏幕上

这是文本字段的代码：

                           Row(
                            mainAxisAlignment: MainAxisAlignment.spaceBetween,
                            children: [
                                    Text(
                                    'Maiden Name :',
                                    style: TextStyle(
                                        fontSize: 16, color: Colors.grey.shade700),
                                     ),
                                    Flexible(
                                    child: SizedBox(
                                      width: MediaQuery.of(context).size.width / 2,
                                      height: 30,
                                      child: TextField(
                                        cursorColor: Colors.grey.shade700,
                                        textAlign: TextAlign.center,
                                        style: TextStyle(fontSize: 16),
                                        decoration: new InputDecoration(
                                          hintText:
                                              'As per your official documents',
                                          hintStyle: TextStyle(
                                              color: Colors.grey.shade900,
                                              fontSize: 10,
                                              fontStyle: FontStyle.italic),
                                          isDense: true,
                                          filled: true,
                                          fillColor: Colors.white,
        
                                          border: OutlineInputBorder(
                                            borderRadius: BorderRadius.circular(5),
                                            borderSide: BorderSide(),
                                          ),
                                          focusedBorder: OutlineInputBorder(
                                            borderRadius: BorderRadius.circular(5),
                                            borderSide: BorderSide(),
                                          ),
                                        ),
                                        controller: familyNameController,
                                      ),
                                    ),
                                  ),
                                 ],

                            

---

我已经找到了解决问题的办法

通过添加

contentPadding: EdgeInsets.symmetric(vertical: 5),

通过删除Flexible widget，将文本字段中的InputDecoration更改为：

Container(
                                    width: MediaQuery.of(context).size.width / 2,
                                    height: 30,
                                    child: TextField(
                                            cursorColor: Colors.grey.shade700,
                                            textAlign: TextAlign.center,
                                            style:
                                                TextStyle(fontSize: 16),
                                            textAlignVertical: TextAlignVertical.center,
                                            decoration: new InputDecoration(
                                              hintText:
                                                  'As per your official documents',
                                              hintStyle: TextStyle(
                                                  color: Colors.grey.shade900,
                                                  fontSize: 10,
                                                  fontStyle: FontStyle.italic),
                                              isDense: true,

                                              //focusColor: Colors.black,
                                              filled: true,
                                              fillColor: Colors.white,
                                              contentPadding: EdgeInsets.symmetric(vertical: 5),

                                              border: OutlineInputBorder(
                                                borderRadius: BorderRadius.circular(5),
                                                borderSide: BorderSide(),
                                              ),
                                              focusedBorder: OutlineInputBorder(
                                                borderRadius: BorderRadius.circular(5),
                                                borderSide: BorderSide(),
                                              ),
                                            ),
                                            controller: surnameController,
                                          ),
                                  ),