fix(editor): should preserve indentation when pasting code with spaces into code block (#11587)

Close [BS-3087](https://linear.app/affine-design/issue/BS-3087/粘贴内容到-code-block-缩进会丢)

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

@@ -71,6 +71,7 @@ export const paragraphBlockMarkdownAdapterMatcher: BlockMarkdownAdapterMatcher =
                 'children'
               )
               .closeNode();
+            walkerContext.skipAllChildren();
             break;
           }
           case 'heading': {

blocksuite/affine/blocks/root/src/clipboard/readonly-clipboard.ts

@@ -34,12 +34,6 @@ const NotionClipboardConfig = ClipboardAdapterConfigExtension({
   priority: 95,
 });
 
-const HtmlClipboardConfig = ClipboardAdapterConfigExtension({
-  mimeType: 'text/html',
-  adapter: HtmlAdapter,
-  priority: 90,
-});
-
 const imageClipboardConfigs = [
   'image/apng',
   'image/avif',
@@ -52,14 +46,20 @@ const imageClipboardConfigs = [
   return ClipboardAdapterConfigExtension({
     mimeType,
     adapter: ImageAdapter,
-    priority: 80,
+    priority: 85,
   });
 });
 
 const PlainTextClipboardConfig = ClipboardAdapterConfigExtension({
   mimeType: 'text/plain',
   adapter: MixTextAdapter,
-  priority: 70,
+  priority: 80,
+});
+
+const HtmlClipboardConfig = ClipboardAdapterConfigExtension({
+  mimeType: 'text/html',
+  adapter: HtmlAdapter,
+  priority: 75,
 });
 
 const AttachmentClipboardConfig = ClipboardAdapterConfigExtension({

blocksuite/affine/inlines/preset/src/adapters/markdown/markdown-inline.ts

@@ -79,6 +79,17 @@ export const markdownListToDeltaMatcher = MarkdownASTToDeltaExtension({
   toDelta: () => [],
 });
 
+export const markdownHtmlToDeltaMatcher = MarkdownASTToDeltaExtension({
+  name: 'html',
+  match: ast => ast.type === 'html',
+  toDelta: ast => {
+    if (!('value' in ast)) {
+      return [];
+    }
+    return [{ insert: ast.value }];
+  },
+});
+
 export const MarkdownInlineToDeltaAdapterExtensions = [
   markdownTextToDeltaMatcher,
   markdownInlineCodeToDeltaMatcher,
@@ -89,4 +100,5 @@ export const MarkdownInlineToDeltaAdapterExtensions = [
   markdownInlineMathToDeltaMatcher,
   markdownListToDeltaMatcher,
   markdownFootnoteReferenceToDeltaMatcher,
+  markdownHtmlToDeltaMatcher,
 ];