Recovery wallet auto complete

[lontivero]

This PR is for improving the recovery wallet mnemonic suggestions, making the suggested words clickable.

[lontivero]

@danwalmsley could you give me a hand, please? This code works okay but there are a couple of thing it would be good if you could review them:

1. After autocompleting the mnemonic texbox by clicking on any suggestion the textbox caret doesn't move to the end of the text, keeping in the middle of the word. I've found a quite awful workaround by implementing a PutCursorAtTheEndTextBoxBehavior behavior to do that but it only works okay if I use a delay. This doesn't look correct to me but I didn't find a better way.

2. After changing my first implementation by one that fit better with the mvvm pattern, i couldn't decide what is the best pattern to notify the parent viewmodel about a child selection event.

[danwalmsley]

Would just like you to consider if the Autocomplete box control is more suitable, if so it might allow better viewmodel code.

[danwalmsley]

typo lastWord :)

[lontivero]

yes, you're right. I cannot listen the national inflation forecast report and program at the same time.

[danwalmsley]

Iv never used it but Avalonia has an inbuilt auto completing textbox control, this might perhaps be more suitable?

https://github.com/AvaloniaUI/Avalonia/blob/master/src/Avalonia.Controls/AutoCompleteBox.cs

It is also in the control catalog if you want to evaluate the way it works.

[lontivero]

Update This can be merged now. Thanks @danwalmsley