fix: curser after table at the end of the document

src/lib/editor/extensions.ts

@@ -27,6 +27,7 @@ import { FormattingMarks } from './formattingMarks';
 import { TableView } from './tableView';
 import { TableColumnResize } from './tableColumnResize';
 import { TableRowResize } from './tableRowResize';
+import { TrailingNode } from './trailingNode';
 
 export const extensions = [
   Document,
@@ -62,6 +63,9 @@ export const extensions = [
   TableCell,
   TableColumnResize,
   TableRowResize,
+  // Guarantees a paragraph after a trailing table so the cursor isn't trapped
+  // and the user can keep writing below a table at the document's end.
+  TrailingNode,
   History,
   Placeholder.configure({ placeholder: 'Start typing…' }),
   TextAlign.configure({

src/lib/editor/trailingNode.ts

@@ -0,0 +1,32 @@
+import { Extension } from '@tiptap/core';
+import { Plugin, PluginKey } from '@tiptap/pm/state';
+
+// Keep an empty paragraph at the end of the document when the last block is a
+// table. A table is an isolating block, so if it sits at the very end there is
+// nowhere to click or type below it — the cursor gets trapped inside the table
+// and the user can't continue the document. When the doc ends with a table we
+// append a paragraph; once it's there the last child is a paragraph, so the
+// check no-ops on the next round (no loop).
+const trailingNodeKey = new PluginKey('trailingNode');
+
+// Block types that can't sit at the document end without trapping the cursor.
+const NEEDS_TRAILING_AFTER = new Set(['table']);
+
+export const TrailingNode = Extension.create({
+  name: 'trailingNode',
+
+  addProseMirrorPlugins() {
+    return [
+      new Plugin({
+        key: trailingNodeKey,
+        appendTransaction(_transactions, _oldState, newState) {
+          const last = newState.doc.lastChild;
+          if (!last || !NEEDS_TRAILING_AFTER.has(last.type.name)) return null;
+          const paragraph = newState.schema.nodes.paragraph;
+          if (!paragraph) return null;
+          return newState.tr.insert(newState.doc.content.size, paragraph.create());
+        },
+      }),
+    ];
+  },
+});