I would even prefer:

static const auto commonSuffixes = { ... };

This way it's an initializer_list and a pattern we use at other places in KTextEditor as well. But of course, your patch is correct as well! Runtime should be the same.

I saw you mentioned this elsewhere, but thought it was a typo. Never seen this before, so curious to leatn what advantage using an initializer list brings here. By the name, i would expect its prpose is usually one-time, to init a bigger structure. But by the code it seems here the list is kept, and simply always iterated over?
Where is the motivation for this?

Because you can write auto and don't have to care. The initializee_list has bwgin(), end(), size(), all which the plain C array does not have:
https://en.cppreference.com/w/cpp/utility/initializer_list

But I could imagine the generated code even looks the same? Maybe @mwolff knows.