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Created attachment 108676 [details] snapshot In attachment is copied snapshot from the issue #195278. Evaluate the code from mentioned area - see the snapshot.
Whole method is called outside of EDT since fixed #177459. Additionally improved speed of calls for getting/checking file mime types: web-main #e8abbe875a59
Integrated into 'main-golden' Changeset: http://hg.netbeans.org/main-golden/rev/e8abbe875a59 User: Martin Fousek <marfous@netbeans.org> Log: #199110 - evaluate PageFlowController.getProjectKnownFileObjects for slowness