How do you feel about a GetElementById for toga?

[proneon267]

Hello
Before creating a pull request, I wanted to know how do you feel about a GetElementById for toga. Is that something you would approve?

[freakboy3742]

Not only would I approve, I already have 😃

app.widgets["my_id"] does widget lookup by ID over the entire app; the same feature is available on a per-window basis.

[proneon267]

Thank you!