IsEditable combox box

[almightyju]

What does the pull request do?

Adds IsEditable property to ComboBox and adds a ItemTextBinding property to get the text value.

What is the current behavior?

Currently it's unsupported.

What is the updated/expected behavior with this PR?

To be able to bind text values in a combo box and it handle the text values and SelectedItem values

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

Added a text box which is bound to TextProperty and only visible when IsEditable is true. Compares the value of the text box with the ItemsSource via an IBinding (similar to the auto complete box)

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

None

Fixed issues

#205.
I am aware that pull request #1070 but it looks like a lot of "ToString" stuff was going on which doesn't really fit with Avalonia, hoping this way is more acceptable

[thevortexcloud]

This sounds very similar to the autocomplete box? Is it different somehow?

https://docs.avaloniaui.net/docs/reference/controls/autocompletebox

[cla-avalonia]

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[almightyju]

This sounds very similar to the autocomplete box? Is it different somehow?

https://docs.avaloniaui.net/docs/reference/controls/autocompletebox

In 2 ways that I can see:

1. combo box has a button to open the dropdown to show all items
2. when you press backspace in the auto complete box it deletes all text, so it's not a true "editable" experience

It's also a much more familiar experience for people coming from WPF that I think it's worth the small change

[almightyju]

@almightyju,

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

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