Editor crashes when my app was updated to latest xamarin.forms 3.4 .0.1008975

[YongqingKyleHuang]

Description

My App crashes by using Editor, when I updated xamarin.forms from 3.2 to3.4 .

It crashes only when my smartphone's orientation is landscape.

It happens only by Andriod. There is no such a bug by iOS.

Steps to Reproduce

1. Andriod, uses portable project, one of tagets is .NET Framework 4.5
2. smartphone's orientation is landscape ( portrait is ok)
3. Input some text for Editor then press "DONE"
4. Crashes:

Java.Lang.IllegalStateException: focus search returned a view that wasn't able to take focus!

Expected Behavior

Basic Information

• Version with issue:

• Last known good version:

• IDE:
  Visual Studio 2017

• Platform Target Frameworks:

  • Android: < 7.1 -->

[YongqingKyleHuang]

Affected device: Moto G(5S)

[kingces95]

Please attached a zipped reproduction. Ideally reduced (start with a blank template project).

[samhouts]

@kylehuang818a Since we haven't heard from you in more than 30 days, we hope this issue is no longer affecting you. If it is, please reopen this issue and provide the requested information so that we can look into it further. Thank you!

[tdduy]

I confirm that issue still exists in Xamarin.Forms 3.4 .0.1009999.

[byishimoaudace]

The issue still exists in Xamarin.Forms 3.4.0.1029999 on SONY Xperia devices

[Brosten]

Very easy to reproduce. New Xamarin Forms Project,
XF version 3.5
Setup page like this:

    <StackLayout>
      <Editor/>
      <Button Text="SomeText" IsEnabled="False"/>
   </StackLayout>

Run on Android phone.
Put it in landscape
Enter edit mode of the editor
Push "Done" button.
Crash

Tested with Samsung Galaxy S7 running Android 8.1. Google keyboard.
@samhouts

[pauldipietro]

Those steps cause the aforementioned crash on an API 27 emulator.

[Brosten]

A lazy workaround I'm using until fixed in XF

   <StackLayout>
      <Editor/>
      <Editor x:Name="CrashStopperHack" 
                    HeightRequest="0" 
                    WidthRequest="0"
                    Focused="CrashStopperHack_Focused"/>
      <Button Text="SomeText" IsEnabled="False"/>
   </StackLayout>

And in code behind

      private void CrashStopperHack_Focused(object sender, FocusEventArgs e)
      {
         CrashStopperHack.Unfocus();
      }

[andreinitescu]

Should be fixed by #5320