Rendering issue while centering Font Awesome icon - dart

Question

I don't understand why this FAB doesn't center it's child. I've tried different things but cannot make it to center perfectly. Because adding for example padding only bottom to the icon could make it center on a Device but maybe not for all.
this is my code
Theme(
data: Theme.of(context).copyWith(
highlightColor: Colors.red, splashColor: Colors.red),
child: SizedBox(
height: MediaQuery.of(context).size.height / 7,
width: MediaQuery.of(context).size.height / 7,
child: FloatingActionButton(
elevation: 100,
shape: new CircleBorder(
side: new BorderSide(
color: Colors.black, width: 5.0)),
backgroundColor: Colors.orangeAccent,
onPressed: () {},
child: new Icon(
FontAwesomeIcons.chevronUp,
size: 80,
)),
),
),
and this is the not centered FAB with it's icon child.
does it seems only to me that the icon isn't centered?

Answer 1

Same code with Icons.person
same code with Text widget
Same code with chevronCircleUp
I've used Show Debug Paint by the way. And I've used chevronCircleUp, just to see clearly the area of widget. I think you are right, it's not centered enough, however, this examples made me think that the problem is related to FontAwesome icons.
There are also this issues
Font Icon Render Box not large enough for some characters
Rectangular icons are centered incorrectly
So I've applied the workaround on the first issue, here is the code. It must be good enough now.
Theme.of(context)
.copyWith(highlightColor: Colors.red, splashColor: Colors.red),
child: SizedBox(
height: MediaQuery.of(context).size.height / 7,
width: MediaQuery.of(context).size.height / 7,
child: FloatingActionButton(
elevation: 100,
shape: new CircleBorder(
side: new BorderSide(color: Colors.black, width: 5.0)),
backgroundColor: Colors.orangeAccent,
onPressed: () {},
child: Text(
String.fromCharCode(
FontAwesomeIcons.chevronUp.codePoint),
style: TextStyle(
fontSize: 72.0,
fontFamily: FontAwesomeIcons.chevronUp.fontFamily,
package: FontAwesomeIcons.chevronUp.fontPackage)),
)),
),
Edit after 3 years:
Issue still exists with Material icon (Icons.ios_share) on Flutter 2.10.0