Increase scroll amount / make it configurable

[davidmartos96]

I don't know if I am the only one, but I find the amount of scroll in go flutter too low in comparison to any other desktop / web application. I found in the source code that currently go-flutter is using 50 as the amount to scroll.

go-flutter/glfw.go

Line 191 in f67b5ec

func (m *windowManager) glfwScrollCallback(window *glfw.Window, xoff float64, yoff float64) {

I compared how much a simple ListView using Flutter web is scrolling and it looks that is a flat 100.
I think it would be great if that amount could be increased or better yet, make it configurable with a constant. At the moment, at least for me, scrolling in a go-flutter app doesn't feel great.

This is the small code I tried to compare Flutter web and go-flutter.

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Page(),
    );
  }
}

class Page extends StatelessWidget {
  const Page({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Scrollbar(
        child: ListView.builder(
          itemCount: 50,
          shrinkWrap: true,
          itemBuilder: (context, i) {
            return Container(
              alignment: Alignment.centerLeft,
              height: 100,
              color: i % 2 == 0 ? Colors.blue : null,
              child: Text("Item $i"),
            );
          },
        ),
      ),
    );
  }
}