如何移除TextField中放大字体后选中文本的行分隔线？

当选中TextField中的全部文本时，每行文本之间会出现一条分隔线，该线条会在增大TextField fontSize时显现。

实际效果 #

预期效果 #

补充说明 #

以下是我编写的可复用TextField代码片段：

TextField(
      onTap: onTap,
      controller: controller,
      focusNode: focusNode,
      obscureText: obscureText ?? false,
      autofocus: autofocus ?? false,
      onChanged: onChanged,
      onEditingComplete: onEditingComplete,
      onSubmitted: onSubmitted,
      scrollPhysics: const BouncingScrollPhysics(),
      maxLines: maxLines,
      minLines: minLines,
      textCapitalization: TextCapitalization.sentences,
      textInputAction: textInputAction,
      keyboardType: TextInputType.multiline,
      selectionWidthStyle: BoxWidthStyle.max,
      readOnly: readOnly!,
      selectionHeightStyle: BoxHeightStyle.strut,
      maxLengthEnforcement: MaxLengthEnforcement.enforced,
      style: TextStyle(
        fontSize: fontSize,
        fontWeight: fontWeight ?? FontWeight.normal,
        
        
        color: color ?? Theme.of(context).primaryColor,
      ),
      enableInteractiveSelection: true,
      decoration: decoration ??
          InputDecoration(
            isDense: isDense,
            border: InputBorder.none,
            icon: iconData ?? widgetIcon,
            suffix: suffix,
            
            hintText: hintText,
            hintStyle: TextStyle(
              fontSize: fontSize ?? hintFontSize,
              fontWeight: fontWeight ?? FontWeight.normal,
            
            ),
          ),
    );

内容的提问来源于stack exchange，提问作者MElochukwu