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It's not convenient when completion popup stays open when complete matching word is entered by the user manually and there are no other suggestions. E.g. when trying to type "#else" or "#endif" the popup stays open. Thus effectively disabling arrow keys. If the user was up to put the mentioned statements into the existing code it's not natural to press enter or space, but it's more natural to use navigation keys after the last char was entered. But arrows do not work and the user is forced to press extra enter without obvious reason