Copy in a single cell should copy only the cell children

[zbeyens]

Given

• a table with the cursor in a single cell

        <editor>
          <htable>
            <htr>
              <htd>{blocks}</htd>
            </htr>
          </htable>
        </editor>

When

• copy

      const blocks = (
        <fragment>
          <hp>
            <anchor />
            11
          </hp>
          <hp>
            12
            <focus />
          </hp>
        </fragment>
      );

Then

• copied fragment is

blocks