fix(json-crdt-extensions): 🐛 skip first empty virtual block

Author: streamich

src/json-crdt-extensions/peritext/block/Fragment.ts

@@ -80,6 +80,8 @@ export class Fragment extends Range implements Printable, Stateful {
     let pair: ReturnType<typeof iterator>;
     while ((pair = iterator())) {
       const [p1, p2] = pair;
+      const skipFirstVirtualBlock = !p1 && this.start.isAbsStart() && p2 && p2.viewPos() === 0;
+      if (skipFirstVirtualBlock) continue;
       const type = p1 ? p1.type() : CommonSliceType.p;
       const path = type instanceof Array ? type : [type];
       const block = this.insertBlock(parent, path, p1, p2);

src/json-crdt-extensions/peritext/lazy/__tests__/import-export-html.spec.ts

@@ -0,0 +1,16 @@
+import {setupKit} from '../../__tests__/setup';
+import {CommonSliceType} from '../../slice';
+import {fromHtml, toViewRange} from '../import-html';
+
+test('a single paragraph', () => {
+  const {peritext} = setupKit();
+  const html = '<p>Hello world</p>';
+  const peritextMl = fromHtml(html);
+  const rangeView = toViewRange(peritextMl);
+  peritext.editor.import(0, rangeView);
+  peritext.refresh();
+  const json = peritext.blocks.toJson();
+  expect(json).toEqual(['', null,
+    [CommonSliceType.p, null, 'Hello world'],
+  ]);
+});