Flutter: keyboard pops out when opening drawer - flutter

Question

everyone
I'm encountering a problem while using Flutter.
Basically when i open my CustomDrawer widget, not always but quite frequently, the keyboard pops out in an unwanted way.
I don't get why it does it... maybe because it re-runs the build method or something i don't know. Down below you can find the code.
Every little bit of information is well appreciated.
Thanks everyone.
Here's the Screen.dart
...
build(context) {
return Scaffold(
extendBodyBehindAppBar: true,
appBar: AppBar(
iconTheme: IconThemeData(color: Colors.white),
backgroundColor: Colors.transparent,
elevation: 0,
),
drawer: CustomDrawer(),
...
And the custom_drawer_widget.dart
...
#override
Widget build(BuildContext context) {
return Drawer(
child: Column(
children: [
Stack(
children: [
Container(
padding: EdgeInsets.all(20),
child: Text(
"Hi, $username",
style: TextStyle(
fontSize: 22,
),
),
alignment: Alignment.bottomLeft,
color: Colors.yellow,
height: 300,
),
],
),
Container(
height: 60.0 * 6,
child: Column(
children: [
Container(
height: 60,
child: FlatButton(
padding: EdgeInsets.symmetric(horizontal: 15, vertical: 10),
highlightColor: Colors.grey[350],
color: Colors.transparent,
onPressed: () {},
child: Row(
children: [
Icon(
Icons.home,
color: Colors.grey[600],
),
SizedBox(width: 30),
Text("Homepage"),
],
),
),
),
ListTile(
leading: Icon(Icons.book),
title: Text("Diary"),
onTap: () {}),
ListTile(
leading: Icon(Icons.chat),
title: Text("Chat"),
onTap: () {}),
ListTile(
leading: Icon(Icons.credit_card),
title: Text("Credit Card"),
onTap: () {}),
ListTile(
leading: Icon(Icons.exit_to_app),
title: Text("Sign Out"),
onTap: () async {
await FirebaseAuth.instance.signOut();
}),
ListTile(
leading: Icon(Icons.settings),
title: Text("Settings"),
onTap: () {}),
],
),
),
Expanded(
child: Container(
padding: EdgeInsets.all(22),
alignment: Alignment.bottomLeft,
child: Row(
children: [
Text("Version 0.1"),
],
),
),
)
],
),
);
}
...

Answer 1

I don't see exactly where you dismiss the keyboard, but I was having the same issue after dismissing the keyboard after a form submit. This fixed my issue.
See this answer here:
https://github.com/flutter/flutter/issues/54277
Where instead of:
onTap: () {
FocusScopeNode currentFocus = FocusScope.of(context);
if (!currentFocus.hasPrimaryFocus) {
currentFocus.unfocus();
}
},
The code should be:
onTap: () {
final FocusScopeNode currentScope = FocusScope.of(context);
if (!currentScope.hasPrimaryFocus && currentScope.hasFocus) {
FocusManager.instance.primaryFocus.unfocus();
}
},