[Bug] Editor PlaceholderColor and BackgroundColor incorrect on UWP after upgrading to Xamarin.Forms 4.8 (from 4.5)

[ivanv-microsoft]

Description

Steps to Reproduce

1. Create a new page with the following control
   <Editor Grid.Row="1" Grid.Column="0" x:Name="VerboseFeedback" Text="" Placeholder="Some long text, doesn't really matter" PlaceholderColor="Gray" VerticalOptions="Start" HorizontalOptions="FillAndExpand" MaxLength="4000" FontSize="12" HeightRequest="100" BackgroundColor="White" TextColor="Black" Margin="10,0,5,5" />
2. Run it on different platforms

Expected Behavior

BackgroundColor is always White
TextColor is always Black
Placeholder text color is always Gray

Actual Behavior

When Editor control is in focus, Background color is "grayish", and White when not in focus

Basic Information

Works fine on Android

• Version with issue:
• Last known good version:
• Platform Target Frameworks:
  • iOS:
  • Android:
  • UWP:
• Android Support Library / AndroidX Version:
• NuGet Packages:
• Affected Devices:

Environment

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Build Logs

Screenshots

Reproduction Link

Workaround

[rachelkang]

Hi, @ivanv-microsoft - thanks for sharing! I was able to reproduce this on UWP on XF 4.8 and up, when a grid background color is set (in your case it appears gray when the background is black). This is not an issue when the grid background is white, and/or on versions of XF 4.7 and below.

Issue13573.zip

[ivanv-microsoft]

That's great, thanks Rachel, hopefully it gets fixed (soon).
Any workarounds you could see when debugging/going through the flow?

Changing background color on the parent grid to white isn't an option, as the entire app theme is "black (& green)".

[jsuarezruiz]

@ivanv-microsoft The issue will be fixed by #13728

[RobbiewOnline]

I'm seeing this too on UWP, in my case the grid background color is explicitly set to white, but when the editor is focused the background colour is dark-gray and the text is black, making it very hard to read. Again, if un-focused the editor renders correctly.