Can FocusManager.{GotFocus|LostFocus} work as a replacement of UIElement.GotFocus & UIElement.LostFocus events?

[MartyIX]

I've been working on a performance-related PR for MAUI here: dotnet/maui#24355.

The idea of the PR is simple: Do not subscribe UIElement.GotFocus and UIElement.LostFocus for each view (see https://github.com/dotnet/maui/pull/24355/files#diff-0d2394868c7630739afe7341642fb408d28ad86539bcdad79b91463a129881beL18-L19) but rather use FocusManager (doc) events GotFocus and LostFocus.

The reason to make such a change is simple. These registrations here are costly.

However, now an unexpected issue arrised. I store each platform view to a helper dictionary here and I expect that FocusManagerGotFocusEventArgs.NewFocusedElement returns the same instance as I stored in the dictionary. But that's not what happens as I debugged that hash code of FocusManagerGotFocusEventArgs.NewFocusedElement is totally different (!) from any element stored in my helper dictionary.

Am I doing something wrong or is it a result of WinRT or something?

Could anybody explain it please?

[MartyIX]

The analysis is wrong. The 3rd commit of dotnet/maui#24695 shows that there were some missing code changes. And the answer to the question:

Can FocusManager.{GotFocus|LostFocus} work as a replacement of UIElement.GotFocus & UIElement.LostFocus events?

seems to "Yes" (as expected).