@Override
	public int getTotalColumnWidth() {
		if (totalColumnWidth == -1) {
			recalcWidthCache();
		}
		return totalColumnWidth;
	}
This returns all columns known by this model, both visible and not seen.
@return all columns known by this model, both visible and not seen.
Ghidra/Framework/Docking/src/main/java/docking/widgets/table/GTableColumnModel.java