Magic ETL Append Tile - show full list of columns added to each input

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In the Append tile, it shows you the count of how many columns will be added to each input (columns present in other input(s) that aren't in that one input). When you hover over the number, it lists the first 20 columns. It would be nice if it would display the entire list of columns and not just the top 20. When combining data sources and renaming columns so they append cleanly, it makes it harder when you can't easily see the entire list of columns that might need renaming.