Treat links under hostedBaseUrl as internal

Resolves #2809

CHANGELOG.md

@@ -19,6 +19,8 @@ title: Changelog
 -   Fix restoration of groups/categories including documents, #2801.
 -   Fixed missed relative paths within markdown link references in documents.
 -   Improved handling of incomplete inline code blocks within markdown.
+-   Direct `https://` links under the `hostedBaseUrl` option's URL will no
+    longer be treated as external, #2809.
 
 ### Thanks!
 

src/lib/output/components.ts

@@ -41,7 +41,7 @@ export abstract class ContextAwareRendererComponent extends RendererComponent {
      */
     protected urlPrefix = /^(http|ftp)s?:\/\//;
 
-    private get hostedBaseUrl() {
+    protected get hostedBaseUrl() {
         const url = this.application.options.getValue("hostedBaseUrl");
         return !url || url.endsWith("/") ? url : url + "/";
     }

src/lib/output/themes/MarkedPlugin.tsx

@@ -332,7 +332,11 @@ export class MarkedPlugin extends ContextAwareRendererComponent {
                 // will be relative links. This will likely have to change with
                 // the introduction of support for customized routers whenever
                 // that becomes a real thing.
-                if (this.markdownLinkExternal && /https?:\/\//i.test(href)) {
+                if (
+                    this.markdownLinkExternal &&
+                    /https?:\/\//i.test(href) &&
+                    !(href + "/").startsWith(this.hostedBaseUrl)
+                ) {
                     token.attrSet("target", "_blank");
                     const classes = token.attrGet("class")?.split(" ") || [];
                     classes.push("external");