Bug XF/AddOn/Manager::coerceAddOnId causes performance issues with large number of add-ons

[Painbaker]

The XF/AddOn/Manager::coerceAddOnId() function repeatedly calls XF/AddOn/Manager::getAvailableAddOnIds() (which is itself relatively slow) and performs repeated array transformations. This leads to a significant performance bottleneck, especially noticeable during active add-on cache rebuilds.

PHP:

protected function coerceAddOnId($addOnId)
{
    $addOnIds = $this->getAvailableAddOnIds();

    $index = array_search(strtoupper($addOnId), array_map('strtoupper', $addOnIds))...

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