The outline in a line — rows 2 levels, 3 groups (1 collapsed) · columns 1 level, 1 group —
or null when nothing is grouped.
Parameters
sheet: ISheet
Returns string|null
Remarks
Counts only: the groups themselves (level, span, summary, collapsed) are IOutline.getGroups,
which is also what a script reads, so the report routes there instead of listing them.
The outline in a line —
rows 2 levels, 3 groups (1 collapsed) · columns 1 level, 1 group— ornullwhen nothing is grouped.