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Syntax Errors annotating works for standalone fxd file only. And doesn't work for fxd placed into fxz archive.
Problem caused by org.netbeans.modules.editor.hints.HintsControllerImpl#linePart (in spi.editor.hints module) which requires EditorCookie retrieved from DataObject to be instanceof CloneableEditorSupport. Which is not true for fxz, where EditorCookie is implemented by FXZDataObject.CommonCookie to wrap different entries and use CloneableEditorSupport for selected entry.
fixed in 3652:956112f1b5c2
rollback fix that has caused a regression, because regression was more important then this issue. http://hg.netbeans.org/javafx/rev/61411f2560ae
http://hg.netbeans.org/javafx/rev/f9b60e9b344d after issue 183588 is fixed, this fix works well.