Bug 148551 [Import/Export] Import File System Problem
When going to import some files if you choose General, then Filesystem. As you browse to the folder where you want to import items from and select it, the option to "Select All" is not available until you either select the folder or a file in the folder.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardFileSystemResourceImportPage1.java
/**
     * Update the tree to only select those elements that match the selected types
     */
    protected void setupSelectionsBasedOnSelectedTypes() {
        ProgressMonitorDialog dialog = new ProgressMonitorJobsDialog(
                getContainer().getShell());
        final Map selectionMap = new Hashtable();
        final IElementFilter filter = new IElementFilter() {
            public void filterElements(Collection files,
                    IProgressMonitor monitor) throws InterruptedException {
                if (files == null) {
                    throw new InterruptedException();
                }
                Iterator filesList = files.iterator();
                while (filesList.hasNext()) {
                    if (monitor.isCanceled()) {
						throw new InterruptedException();
					}
                    checkFile(filesList.next());
                }
            }
            public void filterElements(Object[] files, IProgressMonitor monitor)
                    throws InterruptedException {
                if (files == null) {
                    throw new InterruptedException();
                }
                for (int i = 0; i < files.length; i++) {
                    if (monitor.isCanceled()) {
						throw new InterruptedException();
					}