I have overwritten the quantity field with the jquery as found in the Belgrade theme provided with the Kickstart Demo (custom_form_element.js). This works for the "Add to cart" button but not in the fly-out cart itself.
Overwrite the commerce-cart-flyout-offcanvas-contents-items.html.twig in the Belgrade templates; replace line 8 with:
<button class="number-btn decrement" type="button">-</button>
<input class="form-control form-number" type="number" data-key="<% print(key) %>" min="1" value="<% print(parseInt(orderItem.quantity)) %>" />
<button class="number-btn increment" type="button">+</button>Call the doCartUpdate() function from custom_form_element.js
Write a patch. I'm not sure how one should call the doCartUpdate function from an external script :-(
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
change the value in input element and run. raw example
const input = element.querySelector('input');
input.value += 1;
input.dispatchEvent(new window.Event('change', { bubbles: true }));
setTimeout(() => {
input.dispatchEvent(new window.Event('blur', { bubbles: true }));
}, 200);