Bug 73769 [Dialogs] Open Resource dialog has OK enabled when entry invalid
3.0.1 RC2 - Ctrl+Shift+R - type: WorkbenchWino (note the missing d) and hit Enter - the dialog is dismissed with no action Should disable OK if there is no match.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/ResourceListSelectionDialog.java
} else {
            updateFilterThread = new UpdateFilterThread();
        }
        pattern.addKeyListener(new KeyAdapter() {
            public void keyReleased(KeyEvent e) {
                if (e.keyCode == SWT.ARROW_DOWN)
                    resourceNames.setFocus();
            }
        });
        pattern.addModifyListener(new ModifyListener() {
            public void modifyText(ModifyEvent e) {
                textChanged();
            }
        });
        resourceNames.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                updateFolders((ResourceDescriptor) e.item.getData());
            }
            public void widgetDefaultSelected(SelectionEvent e) {
                okPressed();
            }
        });
        folderNames.addSelectionListener(new SelectionAdapter() {
            public void widgetDefaultSelected(SelectionEvent e) {
                okPressed();
            }
        });
        applyDialogFont(dialogArea);
        return dialogArea;
    }