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As explained in #5254 (comment) it is no longer possible to customize the context menu items, because the classes related to the text field behavior are not accessible. Thus, instead I simply copied the relevant code from openjdk. Pretty ugly workaround... Fixes #5254 and refs javafxports/openjdk-jfx#583.
Moreover, I removed the custom tab handling because it is now working as expected (i.e. #2902 is fixed in Java 9+).