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
protected void enableButtonGroup(boolean enable) {
        selectTypesButton.setEnabled(enable);
        selectAllButton.setEnabled(enable);
        deselectAllButton.setEnabled(enable);
    }
    /**
     *	Answer a boolean indicating whether the specified source currently exists
     *	and is valid
     */
    protected boolean ensureSourceIsValid() {
        if (new File(getSourceDirectoryName()).isDirectory()) {
			return true;
		}
        displayErrorDialog(DataTransferMessages.FileImport_invalidSource);
        sourceNameField.setFocus();
        return false;
    }
    /**
     *	Execute the passed import operation.  Answer a boolean indicating success.
     */
    protected boolean executeImportOperation(ImportOperation op) {
        initializeOperation(op);
        try {
            getContainer().run(true, true, op);
        } catch (InterruptedException e) {
            return false;
        } catch (InvocationTargetException e) {
            displayErrorDialog(e.getTargetException());
            return false;
        }