Fix InlinesCollection Logical/VisualParent update

[Gillibald]

What does the pull request do?

This PR makes sure we update the Logical/VisualParent when an InlinesCollection is attached/detached to/from a TextBlock

What is the current behavior?

What is the updated/expected behavior with this PR?

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

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Breaking changes

Obsoletions / Deprecations

Fixed issues

Fixes: #14670

[avaloniaui-bot]

You can test this PR using the following package version. 11.1.999-cibuild0045183-beta. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[wieslawsoltes]

@Gillibald It fixes the issue but there seems to be difference in rendering result:

There is no space between Some text and buttons.

Inlines Directly

      <TextBlock>
        <TextBlock.Inlines>
          <Run>Some text</Run>
          <InlineUIContainer>
            <StackPanel>
              <Button Content="Button 1" />
              <Button Content="Button 2" />
            </StackPanel>
          </InlineUIContainer>
        </TextBlock.Inlines>
      </TextBlock>

Inlines InlineCollection

      <TextBlock>
        <TextBlock.Inlines>
          <InlineCollection>
            <Run>Some text</Run>
            <InlineUIContainer>
              <StackPanel>
                <Button Content="Button 1" />
                <Button Content="Button 2" />
              </StackPanel>
            </InlineUIContainer>
          </InlineCollection>
        </TextBlock.Inlines>
      </TextBlock>

[Gillibald]

Some text

This is a XamlX issue