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often happens that after closing some files under netbeans the navigator still displaying some content of already closed file, such situation is error prone, I can reproduce several bugs because of it, so I think that after closing file the content from navigator should also disapear
Exactly the same situation: I was editing XML file and Navigator was showing its tree view. I closed XML file -> Navigator still the same. Double click on the element in Navigator opens closed XML file. I expected that Navigator will go blank.
*** This issue has been marked as a duplicate of 153869 ***