[android] ImageButton.CornerRadius operates in DP

[J-Swift]

Description

When you set ImageButton.CornerRadius on android it doesn't convert to px, so it appears wrong.

With this code

var btn = new ImageButton()
{
    WidthRequest = 48,
    HeightRequest = 48,
    Source = ...,
};
btn.CornerRadius = (int)(btn.HeightRequest / 2.0);

This is the result on iOS

This is the result on Android with a 420 dpi screen

Steps to Reproduce

var btn = new ImageButton()
{
    WidthRequest = 48,
    HeightRequest = 48,
    Source = ...,
};
btn.CornerRadius = (int)(btn.HeightRequest / 2.0);

Version with bug

Preview 13 (current)

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

All android with screen dpi != 160

Did you find any workaround?

Convert dp to px manually when setting CornerRadius

Relevant log output

No response

[shimingsg]

verified repro with VS 17.2.0 Preview 2.0 [32228.339.main]
4819.zip

[jsuarezruiz]

Fixed by #4820