Bug: [lexical-table] A node inserted while a ragged table selection ends on a row with only a hole is lost #9756

Summary

With #9749, a table selection whose last row has only a hole and cells spanning from above within the selection (a ragged table) returns that row's TableRowNode as the last node of getNodes(). $insertNodeToNearestRoot (@lexical/utils) starts from the last selected node, so a node inserted while such a selection is active (an image, a horizontal rule) never reaches the document. Before #9749 the same selection threw in getNodes(), so the insert was lost there too, with an error.

Reproduction

Rows ['OUT', A (rowSpan 2), 'B'] and ['OUT2'] (a ragged table, as concurrent row and column inserts leave it, the table transform not run); a table selection from A to B; then $insertNodeToNearestRoot($createHorizontalRuleNode()) (or any block insert that uses it): the node is not in the editor state afterwards.

Direction

Either $insertNodeToNearestRoot should take the focus cell (or the last cell) of a table selection rather than its last node, or getNodes() should not end on a row node. The trailing row is kept on purpose: a copy of the selection needs it, so that a pasted row span is not cut short.