fix(md): dont break on nesting blockquotes inside gfm alerts

closes #3512

src/node/markdown/markdown.ts

@@ -177,6 +177,12 @@ export interface MarkdownOptions extends MarkdownIt.Options {
    */
   math?: boolean | any
   image?: ImageOptions
+  /**
+   * Allows disabling the github alerts plugin
+   * @default true
+   * @see https://vitepress.dev/guide/markdown#github-flavored-alerts
+   */
+  gfmAlerts?: boolean
 }
 
 export type MarkdownRenderer = MarkdownIt
@@ -209,7 +215,6 @@ export const createMarkdownRenderer = async (
     .use(preWrapperPlugin, { hasSingleTheme })
     .use(snippetPlugin, srcDir)
     .use(containerPlugin, { hasSingleTheme }, options.container)
-    .use(gitHubAlertsPlugin, options.container)
     .use(imagePlugin, options.image)
     .use(
       linkPlugin,
@@ -218,6 +223,10 @@ export const createMarkdownRenderer = async (
     )
     .use(lineNumberPlugin, options.lineNumbers)
 
+  if (options.gfmAlerts !== false) {
+    md.use(gitHubAlertsPlugin)
+  }
+
   // 3rd party plugins
   if (!options.attrs?.disable) {
     md.use(attrsPlugin, options.attrs)

src/node/markdown/plugins/githubAlerts.ts

@@ -22,12 +22,19 @@ export const gitHubAlertsPlugin = (
     const tokens = state.tokens
     for (let i = 0; i < tokens.length; i++) {
       if (tokens[i].type === 'blockquote_open') {
-        const open = tokens[i]
         const startIndex = i
-        while (tokens[i]?.type !== 'blockquote_close' && i <= tokens.length)
-          i += 1
-        const close = tokens[i]
-        const endIndex = i
+        const open = tokens[startIndex]
+        let endIndex = i + 1
+        while (
+          !(
+            tokens[endIndex].type === 'blockquote_close' &&
+            tokens[endIndex].level === open.level
+          ) &&
+          endIndex < tokens.length
+        )
+          endIndex++
+        if (endIndex === tokens.length) continue
+        const close = tokens[endIndex]
         const firstContent = tokens
           .slice(startIndex, endIndex + 1)
           .find((token) => token.type === 'inline')