[Shell][Android] The truth is out there...but not on top tab search handlers

[davidbritch]

Description

I have this tab structure in my Shell app:

    <TabBar>
       <Tab Title="Domestic"
            Icon="paw.png">
           <ShellContent Title="Cats"
                         ContentTemplate="{DataTemplate views:CatsPage}" />
           <ShellContent Title="Dogs"
                         ContentTemplate="{DataTemplate views:DogsPage}" />
       </Tab>
      ...
    </TabBar>

So this gives us a Domestic bottom tab, and Cats and Dogs top tabs (within the Domestic tab).

CatsPage has a search handler which searches the cats data:

    <Shell.SearchHandler>
        <controls:AnimalSearchHandler Placeholder="Enter search term"
                                      ShowsResults="true"
                                      ItemTemplate="{StaticResource AnimalSearchTemplate}"
                                      Animals="{x:Static data:CatData.Cats}"
                                      SelectedItemNavigationTarget="{x:Type views:CatDetailPage}" />
   </Shell.SearchHandler>

It works fine:

On DogsPage there's also a search handler that searches the dogs data:

    <Shell.SearchHandler>
        <controls:AnimalSearchHandler Placeholder="Enter search term"
                                      ShowsResults="true"
                                      ItemTemplate="{StaticResource AnimalSearchTemplate}"
                                      Animals="{x:Static data:DogData.Dogs}"
                                      SelectedItemNavigationTarget="{x:Type views:DogDetailPage}" />
    </Shell.SearchHandler>

However, using this search handler searches the cats data:

This problem is only occurring for bottom tabs that also contain top tabs. For the elephants/monkeys/bears page the search handlers work as expected.

The problem might also occur on platforms other than Android, but right now in SR2 the app crashes on iOS/MacCatalyst, and on Windows the search handler doesn't template the results.

Repo: Xaminals.zip

Steps to Reproduce

1. Run the attached sample on Android.
2. Navigate to the Dogs top tab and search for dogs data. It searches cats data.

Version with bug

6.0.408

Last version that worked well

Unknown/Other

Affected platforms

Android

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[Zhanglirong-Winnie]

Verified this issue with Visual Studio Enterprise 17.6.0 Preview 7.0. Repro on android platform with sample project.
Xaminals.zip