Improve property system to facilitate correct usage

[Kevin Rushforth]

This will take a while to work through, and we will need to get general 
consensus on the API changes.

I doubt I can support incompatible breaking changes in this area, given 
how fundamental property and bindings are to JavaFX. I'll take a look, 
but it is likely that the incompatible API changes part of your proposed 
change will not be accepted.

The changes enforcing correct usage should be a lot less controversial 
and easier to get through.

-- Kevin


On 7/27/2021 4:23 PM, Michael Strauß wrote:
> I propose a set of changes to the JavaFX property system that I've
> outlined in this PR: https://github.com/openjdk/jfx/pull/590
>
> The changes fall into two categories: enforcement of correct usage
> (there are several cases listed in the PR), and deprecating untyped
> APIs (for removal in a future version) so as to make the intent of the
> API more clear to developers.
>
> Even though there are breaking changes, the impact on application code
> should be minimal. I'd welcome any comments on this proposal.