Only flush the plugins cache, not *all* WP caches. #325
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This will save a lot of overhead of other (page/metadata) caches having to be recreated because we flushed them.
This function was introduced in WP 3.7, so requires upping the minimum requirement of TGMPA.
Alternatively - if we wouldn't want to up the minimum requirement yet -, we could wrap this in a
function_exists()
if then else block.[Edit]
Looking into this further, we could also choose to remove the flush calls completely and just up the minimum requirements as a quick check shows that WP 3.7+ will flush the plugin cache already. This, however, would need to be thoroughly checked for all situations in which we flush the cache.