Full-width rows
"Full-width rows" are rows whose content takes the entire grid width instead of being cell-by-cell - useful for inline editors, banner ads, section dividers, and detail-row expansions.
Status
Built-in support - through enableRowSummaries={true} for a single
sticky footer row - exists; arbitrary mid-table full-width rows are
not built in.
For inline master/detail (where expanding a row reveals a child) see
demos/08-tree-and-master-detail.svelte:
the demo expands a row to mount a second <SvGrid> underneath, with the
detail keyed to the parent.
Workaround - render a divider between groups
When you only need a visual band (no editing, no nested grid), render a plain DOM band above the grid for sticky banners, or use grouping to get a "group label" row that visually spans the row width through the indented label column.
Tracked at
Missing features - first-class full-width rows and detail-row API.