Add AutomationPeer for Panel

[NeverMorewd]

What does the pull request do?

In the UI Automation tool (Inspect.exe), several container controls have their LocalizedControlType set to none. While examining the AvaloniaUI codebase, I found that AutomationControlType.Panel is defined but not properly applied. This should be addressed by implementing a new PanelAutomationPeer to provide the correct control type information.

What is the current behavior?

The LocalizedControlType of Panel is none

What is the updated/expected behavior with this PR?

The LocalizedControlType property of a Panel can show descriptive text

How was the solution implemented (if it's not obvious)?

Checklist

Breaking changes

Obsoletions / Deprecations

Fixed issues

[avaloniaui-bot]

You can test this PR using the following package version. 11.3.999-cibuild0053100-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

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[NeverMorewd]

@NeverMorewd,

Please read the following Contributor License Agreement (CLA). If you agree with the CLA, please reply with the following:

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@cla-avalonia agree

[MrJul]

While this solves the described issue, I believe we shouldn't expose panels to automation at all.

The automation documentation for Pane states:

The Pane control type is for potentially scrollable regions that have disparate content. It is used to represent an object within a frame or document window. Users can navigate between pane controls and within the contents of the current pane.

Panels don't fall into this category (ScrollViewer does and is exposed as a Pane). In my opinion they shouldn't appear in the automation tree. That's what WPF and UWP do.

Pinging @grokys for further input.

[NeverMorewd]

Currently. Panel is included in automation tree as a node whose LocalizedControlType is "none".