RFR: 8245575: Show the ContextMenu of input controls with long press gesture on iOS

[Johan Vos]

On Fri, 22 May 2020 11:45:25 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

> This PR uses iOS long press gesture to generate a menu event that will trigger a `ContextMenuEvent`.
> 
> Based on this event, input controls will show the ContextMenu (once JDK-8245499 is fixed), and if required, a developer
> could add an event handler based on `ContextMenuEvent.CONTEXT_MENU_REQUESTED` for custom processing of such event.

Marked as reviewed by jvos (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/232