IMHO, either do not have separate columns for each script, or at least try to rearrange the columns to avoid white empty blocks in the middle of listings.
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How can this be reproduced, if it's even still relevant?
I suppose that it's for selecting IME. What causes it to be medium-width in this context?
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The size depends on the number of languages (unless explicit size is given).
What is to be done? Improved grouping algorithm? Not grouping in medium size? Please clarify requirements.