Please see the changelogchangelog - this is to demonstrate an issue with the toolbar buttons and existing square brackets.
Testing arrays in arrays:
b[0][1] b[1][2] b[1][3] b[0][4] (b[0][5] b[1][6]) (b[0][7] b[0][8])

a_b_c
a__b__c
a___b___c
a____b____c