Steps to Reproduce

1. Put keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag in a SingleChildScrollView, which has TextField among the children.
2. Tap on the TextField to focus on it.
3. Dismiss the keyboard by scrolling the page
4. Open the drawer

Expected results:
When the drawer is opened, keyboard stays there

Actual results:
Keyboard pops out

Similar Issue
#54277: This gives the solution to dismiss the keyboard properly, and I think the proper way of dismissing it is not applied on SingleChildScrollView's .onDrag code.

    return Scaffold(
      appBar: AppBar(),
      drawer: Drawer(),
      body: SingleChildScrollView(
        keyboardDismissBehavior: ScrollViewKeyboardDismissBehavior.onDrag,
        child: SafeArea(
          child: Column(
            children: [
              TextFormField(),
            ],
          ),
        ),
      ),
    );