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bugfix: crash when using mouse wheel

All the Text functions assume the cursor is always on a text line. I was violating that invariant.

  • When scrolling up, I start the cursor at the top-most line below the screen top.

  • When scrolling down, I start the cursor at the top-most line below the screen bottom.

    I think it would feel slightly more natural for it to be the bottom-most line above the screen bottom.

    However, the Text functions maintain an invariant that the bottom-most line in a buffer will be text. There's no such invariant for the top-most line.

Created by  Kartik K. Agaram  on September 15, 2023
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