Flutter AlertDialog弹窗表单正常显示但确认取消按钮不出现问题求助

• AlertDialog默认scrollable属性为false，当表单内容高度超出弹窗最大可展示高度时，内容区域会直接挤占操作按钮的布局空间，导致按钮被挤出可视范围
• 表单嵌套的Column默认mainAxisSize为MainAxisSize.max，会尽可能占用纵向空间，进一步放大了空间挤占的问题

return AlertDialog(
  // 新增scrollable属性设为true，让弹窗支持内容滚动，保留actions展示空间
  scrollable: true,
  title: Center(
    child: Text("CREAZIONE UTENTI"),
  ),
  content: Form(
    child: SingleChildScrollView(
      child: Column(
        // 新增mainAxisSize设为min，让Column仅占用实际需要的高度
        mainAxisSize: MainAxisSize.min,
        children: [
          //tasti per inserimento dati
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: TextFormField(
              controller: _nameTextController,
              decoration: buildInputDecoration(
                  label: "Nome Account", hintText: "Nome"),
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: TextFormField(
              controller: _surnameTextController,
              decoration: buildInputDecoration(
                  label: "Cognome Account", hintText: "Cognome"),
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: TextFormField(
              controller: _usernameTextController,
              decoration: buildInputDecoration(
                  label: "Username Account", hintText: "Username"),
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: TextFormField(
              controller: _passwordTextController,
              decoration: buildInputDecoration(
                  label: "Password Account", hintText: "Password"),
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: TextFormField(
              controller: _mailTextController,
              decoration: buildInputDecoration(
                  label: "Indirizzo email Account",
                  hintText: "admin@admin.com"),
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: TextFormField(
              controller: _ruoloTextController,
              decoration: buildInputDecoration(
                  label: "Ruolo Account", hintText: "admin, utente"),
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(8.0),
            child: TextFormField(
              controller: _applicationTextController,
              decoration: buildInputDecoration(
                  label: "Applicazioni abilitate",
                  hintText: "Aplicazione abilitata"),
            ),
          ),
        ],
      ),
    ),
  ),
  actions: [
    Padding(
      padding: const EdgeInsets.all(8.0),
      child: TextButton(
          onPressed: () async {
            //agg
          },
          child: Text("Conferma")),
    ),
    Padding(
      padding: const EdgeInsets.all(8.0),
      child: TextButton(
          onPressed: () {
            Navigator.of(context).pop();
          },
          child: Text("Cancella")),
    ),
  ],
);

修改后弹窗会自动为底部操作按钮预留固定展示空间，表单内容过多时仅content区域可滚动，两个操作按钮会始终固定显示在弹窗底部，不会被内容挤出可视范围。

内容的提问来源于stack exchange，提问作者lorenzo borgato