It seems to me like this is merely the space left for accents - even if the text is "AEOU" the cursor (and selection) will be high enough to accomodate for "ÁÉÓÚ". If you use other characters, say "私は猫がすきです", the spacing will differ.
It seems to me like this is merely the space left for accents - even if the text is "AEOU" the cursor (and selection) will be high enough to accomodate for "ÁÉÓÚ". If you use other characters, say "私は猫がすきです", the spacing will differ.