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Netbeans platform is foisting the buggy class org.netbeans.swing.dirchooser.DirectoryChooserUI when we're going to get a Dialog from a JFileChooser with DIRECTORIES_ONLY selectionMode. The CheckThreadViolationRepaintManager (issue 128582) complains continuously when changing directories in that dialog. Inspecting the java source, we found some code lines where outside the EDT the data model (TreeModel) is changed and AWT propertyChanges are fired. This results in corrupted content of the dialog as you can see in the attachment.
Created attachment 72250 [details] Corrupt UI content
Created attachment 72251 [details] EDT violations
fix: http://hg.netbeans.org/cdev/rev/89bfcad6b750
Integrated into 'main-golden', will be available in build *201010120000* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/89bfcad6b750 User: Ondrej Vrabec <ovrabec@netbeans.org> Log: Issue #150700 - Corrupt content with a JFileChooser dialog
fix: http://hg.netbeans.org/cdev/rev/cea43415d7ea