TextBounds for is_run_visible is clamped to be the same as the viewport resolution

[jose-acevedoflores]

#110 changed the criteria for determining what is visible compared to the original method in #108.
From start_y <= text_area.bounds.bottom && text_area.bounds.top <= end_y
To start_y <= bounds_max_y && bounds_min_y <= end_y
and the bounds_max//min is clamped.

My case uses a TextBound that is bigger than the resolution so I can shift my TextArea beyond what is visible.

I'm wondering if that change in #110 to use the clamped bounds is intended.