[BLUEJ-1286] Investigate fixing JavaFX bugs

There are a few JavaFX bugs that affect us and prevent us removing the last uses of Swing and similar from our code:

• File open bug: https://bugs.openjdk.java.net/browse/JDK-8187992
• Java Desktop: https://bugs.openjdk.java.net/browse/JDK-8091107

It looks like these are unlikely to be fixed by themselves, so we should investigate how feasible it is to fix these bugs.

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Issue metadata

• Issue type: Bug
• Priority: Medium