Enter in table cell adds a row after the current one (#4186)

Co-authored-by: Tom Moor <tom.moor@gmail.com>

shared/editor/queries/getRowIndex.ts

@@ -9,3 +9,13 @@ export default function getRowIndex(selection: CellSelection) {
   const path = (selection.$from as any).path;
   return path[path.length - 8];
 }
+
+export function getRowIndexFromText(selection: CellSelection) {
+  const isRowSelection = selection.isRowSelection && selection.isRowSelection();
+  const path = (selection.$from as any).path;
+  if (isRowSelection) {
+    return path[path.length - 8];
+  } else {
+    return path[path.length - 11];
+  }
+}