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When reading music or song lyrics from a text file you want to reduce scrolling to an absolute minimum, but the linear nature of text views means that even if you have very narrow text you can't use all the extra space on the side to see more text. An app that opens text files in multiple columns, and scrolling them horizontally would be super useful for cases like that.

Basically, instead of a single column that scrolls vertically the text would be split into lots of horizontally stacked columns, none of which have any vertical scrolling. The entire view would then scroll horizontally. When changing the window height the content would reflow between columns to avoid vertical scrolling.