title: WordPress Gutenberg block template columns with RangeControl
body: <p>i have the following code:</p>
  
  <pre><code>    const BLOCKS_2COL_TEMPLATE = [
      ['core/columns', {
          columns: 2,
          className: "row",
      },
          [
              ['core/column', {
                  className: "col-md-6",
              },],
              ['core/column', {
                  className: "col-md-6",
              },],
          ]
      ],
  ];
  </code></pre>
  
  <p>That works fine. But if I select my block content, I have the option to select more columns via the RangeControl field. How can I prevent this?</p>
  
  <p>Smething like this:</p>
  
  <pre><code>['core/columns', {
      columns: 2,
      className: "row",
      RangeControl: {
          min: 2,
          max: 2,
      }
  },
  </code></pre>
  
  <p>But this doesn't work.</p>