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On 12/19/2018 at 9:59 PM, ciepolml said:

PrestaShop 1.7.x Smooth solution

<div class="navbar-toggler collapse-icons" data-toggle="collapse" data-target="#exCollapsingNavbar{$node.id}"{if !$_collapse} aria-expanded="true"{/if}>
<i class="material-icons add"></i>
<i class="material-icons remove"></i>
</div>

Thank you for sharing your solution. 
It's not working for me  - $_collapse variable is not available. Where do you get the value, did you extended php of the module?