Thanks, but I use the default Samsung keyboard.
Now that I recall, I've recently accepted 2 updates from the Samsung Galaxy store, one was called Device maintenance, and the other I completely forgot. This was about the same time that Opera was updated. Unfortunately there seems to be no "history" of installed updates in the idiotic Galaxy Store.
This issue happens on certain sites only, not in every single one, which is even more bizarre.
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Auto spell check is disabled, and it should underline words in RED according to its settings:
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Any more ideas will be really appreciated, this is quite annoying and I don't want to switch to Samsung Internet nor Firefox, I've been an Opera fan since I got it for my Nokia 5530 with Symbian ages ago. (I'm definitely not switching to Chrome ever)