fix(editor): import & save logic (#15098)

fix #15080
fix #15085
fix #15031
fix #15094


#### PR Dependency Tree


* **PR #15098** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
  * Improved code-block paste behavior for plain-text insertion
  * Fixed block selection ordering to reflect document model
  * Made table cell formatting resilient to conversion errors
  * Ensured user feature list is consistently returned as an array

* **Refactor**
  * Streamlined authentication session fetch and profile enrichment flow

* **Tests**
  * Added tests for markdown blockquote list preservation
  * Added authentication session validation tests
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/paragraph/src/adapters/markdown.ts

@@ -5,10 +5,11 @@ import {
   IN_PARAGRAPH_NODE_CONTEXT_KEY,
   isCalloutNode,
   type MarkdownAST,
+  type MarkdownDeltaConverter,
 } from '@blocksuite/affine-shared/adapters';
-import type { DeltaInsert } from '@blocksuite/store';
+import type { BlockSnapshot, DeltaInsert } from '@blocksuite/store';
 import { nanoid } from '@blocksuite/store';
-import type { Heading } from 'mdast';
+import type { Blockquote, Heading, List, ListItem } from 'mdast';
 
 /**
  * Extend the HeadingData type to include the collapsed property
@@ -24,6 +25,131 @@ const PARAGRAPH_MDAST_TYPE = new Set(['paragraph', 'heading', 'blockquote']);
 const isParagraphMDASTType = (node: MarkdownAST) =>
   PARAGRAPH_MDAST_TYPE.has(node.type);
 
+const joinDeltaLines = (
+  lines: DeltaInsert[][],
+  prefix?: string
+): DeltaInsert[] => {
+  const deltas: DeltaInsert[] = [];
+  lines.forEach(line => {
+    if (deltas.length) deltas.push({ insert: '\n' });
+    if (prefix) deltas.push({ insert: prefix });
+    deltas.push(...line);
+  });
+  return deltas;
+};
+
+const flattenListItemToDelta = (
+  node: ListItem,
+  deltaConverter: MarkdownDeltaConverter,
+  prefix: string,
+  depth: number
+): DeltaInsert[] => {
+  const firstParagraph = node.children[0];
+  const lines: DeltaInsert[][] = [];
+  if (firstParagraph?.type === 'paragraph') {
+    lines.push([
+      { insert: prefix },
+      ...deltaConverter.astToDelta(firstParagraph),
+    ]);
+  } else {
+    lines.push([{ insert: prefix.trimEnd() }]);
+  }
+  node.children
+    .slice(firstParagraph?.type === 'paragraph' ? 1 : 0)
+    .forEach(child => {
+      const delta = flattenMarkdownBlockToDelta(
+        child as MarkdownAST,
+        deltaConverter,
+        depth + 1
+      );
+      if (delta.length) {
+        lines.push(delta);
+      }
+    });
+  return joinDeltaLines(lines);
+};
+
+const flattenMarkdownBlockToDelta = (
+  node: MarkdownAST,
+  deltaConverter: MarkdownDeltaConverter,
+  depth = 0
+): DeltaInsert[] => {
+  switch (node.type) {
+    case 'paragraph':
+    case 'heading':
+      return deltaConverter.astToDelta(node);
+    case 'list': {
+      const list = node as List;
+      return joinDeltaLines(
+        list.children.map((item, index) => {
+          const order = (list.start ?? 1) + index;
+          const prefix =
+            '  '.repeat(depth) + (list.ordered ? `${order}. ` : '- ');
+          return flattenListItemToDelta(item, deltaConverter, prefix, depth);
+        })
+      );
+    }
+    case 'blockquote':
+      return flattenBlockquoteToDelta(node as Blockquote, deltaConverter);
+    default:
+      return 'children' in node
+        ? joinDeltaLines(
+            (node.children as MarkdownAST[]).map(child =>
+              flattenMarkdownBlockToDelta(child, deltaConverter, depth)
+            )
+          )
+        : [];
+  }
+};
+
+const flattenBlockquoteToDelta = (
+  node: Blockquote,
+  deltaConverter: MarkdownDeltaConverter
+) =>
+  joinDeltaLines(
+    node.children.map(child =>
+      flattenMarkdownBlockToDelta(child as MarkdownAST, deltaConverter)
+    )
+  );
+
+const getSnapshotTextDelta = (node: BlockSnapshot): DeltaInsert[] => {
+  const text = (node.props.text ?? { delta: [] }) as {
+    delta: DeltaInsert[];
+  };
+  return text.delta;
+};
+
+const flattenSnapshotBlockToDelta = (
+  node: BlockSnapshot,
+  depth = 0
+): DeltaInsert[] => {
+  if (node.flavour === 'affine:list') {
+    const type = node.props.type;
+    const order = (node.props.order as number | undefined) ?? 1;
+    const prefix =
+      '  '.repeat(depth) + (type === 'numbered' ? `${order}. ` : '- ');
+    return joinDeltaLines([
+      [{ insert: prefix }, ...getSnapshotTextDelta(node)],
+      ...node.children.map(child =>
+        flattenSnapshotBlockToDelta(child, depth + 1)
+      ),
+    ]);
+  }
+  return joinDeltaLines([
+    getSnapshotTextDelta(node),
+    ...node.children.map(child => flattenSnapshotBlockToDelta(child, depth)),
+  ]);
+};
+
+const flattenQuoteSnapshotToDelta = (
+  text: DeltaInsert[],
+  children: BlockSnapshot[]
+) =>
+  joinDeltaLines([
+    text,
+    ...children.map(child => flattenSnapshotBlockToDelta(child)),
+  ]);
+
 export const paragraphBlockMarkdownAdapterMatcher: BlockMarkdownAdapterMatcher =
   {
     flavour: ParagraphBlockSchema.model.flavour,
@@ -93,7 +219,10 @@ export const paragraphBlockMarkdownAdapterMatcher: BlockMarkdownAdapterMatcher =
                     type: 'quote',
                     text: {
                       '$blocksuite:internal:text$': true,
-                      delta: deltaConverter.astToDelta(o.node),
+                      delta: flattenBlockquoteToDelta(
+                        o.node as Blockquote,
+                        deltaConverter
+                      ),
                     },
                   },
                   children: [],
@@ -160,6 +289,10 @@ export const paragraphBlockMarkdownAdapterMatcher: BlockMarkdownAdapterMatcher =
             break;
           }
           case 'quote': {
+            const quoteDelta = flattenQuoteSnapshotToDelta(
+              text.delta,
+              o.node.children
+            );
             walkerContext
               .openNode(
                 {
@@ -171,12 +304,13 @@ export const paragraphBlockMarkdownAdapterMatcher: BlockMarkdownAdapterMatcher =
               .openNode(
                 {
                   type: 'paragraph',
-                  children: deltaConverter.deltaToAST(text.delta),
+                  children: deltaConverter.deltaToAST(quoteDelta),
                 },
                 'children'
               )
               .closeNode()
               .closeNode();
+            walkerContext.skipAllChildren();
             break;
           }
         }