Expose XOffset in Viewport

[tjbarber]

I made the mistake of not creating this before putting up a PR, my apologizes!

I've run into a situation where I want to be able to move the viewport horizontally by a variable amount. This allows me to do something like this:

2025-03-25.11-34-13.mp4

You can get the idea for how I'm using it by this (not great) piece of code, where I'm using the XOffset to calculate the difference of the width of the all the columns to the right of my screen (including the one on the far right that is partially outside of it) and the width of the all the content - the XOffset. The difference is how much I need to move to the left so I can view the whole cell.

func (m *Model) previousColumnDistanceAway() int {
	colsToTheRight := m.cols[m.cursor.colIdx:]
	horizontalPadding := m.styles.Cell.GetHorizontalPadding()
	widthOfColsToRight := 0

	for _, col := range colsToTheRight {
		widthOfColsToRight += col.Width + horizontalPadding
	}

	remainingRightSpace := m.contentWidth - m.viewport.XOffset

	if widthOfColsToRight > remainingRightSpace {
		return widthOfColsToRight - remainingRightSpace
	}

	return 0
}

[tjbarber]

I put a PR up for this here

[bashbunni]

Hey @tjbarber thank you for bringing this up. Have you tried Viewport on v2-exp yet? We added horizontal scroll to the bubble for v2. That might solve what you're looking for here... If not, do let us know and we'll think more about the use case you're describing