RFR: JDK-8302355: Public API for Toolkit.canStartNestedEventLoop()

[John Hendrikx]

On Mon, 13 Feb 2023 19:31:56 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

> This PR adds the last missing method for dealing with nested event loops.
> As also written in the ticket, there is currently no (public) way to find out whether it is safe to start an event loop now or not.
> Classes like `Dialog` check via `Toolkit.getToolkit().canStartNestedEventLoop()` (sun api), if it safe to start a nested event loop before doing so.

Okay, I found the use case you had, apparently you want to be able to show dialogs from an uncaught exception handler which could trigger when an exception occurs during layout.  When it returns `false` you use `Platform.runLater`, but what's the reason you don't always use `Platform.runLater` to show the dialog?

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PR: https://git.openjdk.org/jfx/pull/1031