RFR: 8240969: WebView does not allow to load style sheet in modularized applications

[Tobias Diez]

On Thu, 12 Mar 2020 21:31:22 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Sorry for the delay, but I've finally managed to create the required bug report (internal review ID : 9063979)
>
> This has now been transferred to the JDK project as [JDK-8240969](https://bugs.openjdk.java.net/browse/JDK-8240969).
> You can update the title of this PR to include the bug ID, followed by a `:`, then a space, then the exact title from
> the bug you are fixing. So:  8240969: WebView does not allow to load style sheet in modularized applications
> 
> I note that we still need a test program that fails currently, and passes with your patch.

I've changed the title accordingly. However, I've no idea how to add a test and couldn't find any unit test concerning
`UserStyleSheetLocation` (apart from some tests that make sure it was invoked on the Javafx thread).

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PR: https://git.openjdk.java.net/jfx/pull/22