[TokenizingTextBox] Keep text after a query is submitted

[smumovic]

Fixes CommunityToolkit/Windows#168

Add the ability (via a XAML bool property) to keep the typed text after a QuerySubmitted event finishes. This will make the TTB useful in an 'advanced search' scenario when the user selects tokens from a list that help narrow the search criteria to a certain sub-domain (for example to search only through a certain field or several fields if more tokens are selected).

PR Type

What kind of change does this PR introduce?

Feature

What is the current behavior?

Currently the TTB deletes the entered text after a submit is made (either by pressing enter or by selecting a proposed token).

What is the new behavior?

By adding the KeepTextAfterQuerySubmitted property to the XAML and setting it to true you can modify the behavior to keep the typed text inside the text box after submitting it. The proposed solution is backward compatible as the property defaults to "false" (behaves like it currently does).

PR Checklist

Please check if your PR fulfills the following requirements:

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• Tested code with current supported SDKs
• Added description of major feature to project description for NuGet package (4000 total character limit, so don't push entire description over that)
• Contains NO breaking changes

Other information

[ghost]

Thanks smumovic for opening a Pull Request! The reviewers will test the PR and highlight if there is any conflict or changes required. If the PR is approved we will proceed to merge the pull request 🙌

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[smumovic]

@dotnet-policy-service agree

[smumovic]

@dotnet-policy-service agree

[michael-hawker]

Thanks @smumovic for the PR, this code has moved to our new repository https://github.com/CommunityToolkit/Windows, I've moved the issue there: CommunityToolkit/Windows#168

Will move discussion to the issue for now, as not sure on the name of the property. Interesting use-case though.