Grouped buttons are not displayed correctly if some of them are hidden

To be clear, in XenForo out of the box there are no problems with this, since the only use case is grouping always visible buttons:

But I needed to hide some buttons by default and display them via JS. And there is a problem: if the first or last button is hidden, the next or previous ones will have non-rounded borders:


Spoiler: Possible fix
To get around this problem, I wrote the following LESS:
Less:

.fixedButtonGroup
{
    display: inline-block;
    vertical-align: top...

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