Bug 64890 Package explorer out of sync when open/closing projects [package explorer]
RC1 - close a project - Open the closed project in a new window va Open in New Window context menu action - open the project observe: the Java project is rendered in the additional window as folders and CUs not on the class path.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerActionGroup.java
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