pixelRatio for rendered Flutter widget should default to the device's pixel ratio

[ueman]

When creating screenshot widget with

var path = await HomeWidget.renderFlutterWidget(
  const LineChart(),
  key: 'lineChart',
  logicalSize: const Size(400, 400),
  pixelRatio: 3,
);

You're able to set a pixelRatio. This should default to whatever is set in MediaQueryData.devicePixelRatio. Another way of accessing that data should be possible via the PlatformDispatcher.instance.implicitView.devicePixelRatio.

It should default to whatever the current device pixelratio is, since otherways I always have to manually set it to that value. So by doing this already inside the app, it improves the quality of life of the users.

So this

var path = await HomeWidget.renderFlutterWidget(
  const LineChart(),
  key: 'lineChart',
  logicalSize: const Size(400, 400),
  pixelRatio: PlatformDispatcher.instance.implicitView?.devicePixelRatio ?? 3,
);

becomes this

var path = await HomeWidget.renderFlutterWidget(
  const LineChart(),
  key: 'lineChart',
  logicalSize: const Size(400, 400),
);

and the screenshot of the widget is always in the correct resolution.

Additionally, I believe this piece of code

home_widget/lib/home_widget.dart

Line 149 in daea9c1

devicePixelRatio: 1.0,

should also reuse the configured pixel ratio, right?