[8u-dev] Request for approval 8181786 Extra runLater causes impossible states to be possible using javafx.embed.singleThread=true

[Alexander Zvegintsev]

Hello,

Please approve the backport of this fix, the patch applies cleanly to 
8u-dev.

bug: https://bugs.openjdk.java.net/browse/JDK-8181786

changeset: http://hg.openjdk.java.net/jdk10/client/jdk/rev/dbb5b171a16b

review thread: https://bugs.openjdk.java.net/browse/JDK-8181786

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Thanks,
Alexander.