Allow scroll propagation outside code editor (go-gitea#36502)

Fix go-gitea#28479

When scrolling inside the editor and the editor has already reached the
end of its scroll area, the browser does not continue scrolling. This is
inconvenient because users must move the cursor out of the editor to
scroll the page further.

This PR enables automatic switching between the editor’s scroll and the
browser’s scroll, allowing seamless continuous scrolling.

Author: lunny

web_src/js/features/codeeditor.ts

@@ -35,7 +35,7 @@ const baseOptions: MonacoOpts = {
   renderLineHighlight: 'all',
   renderLineHighlightOnlyWhenFocus: true,
   rulers: [],
-  scrollbar: {horizontalScrollbarSize: 6, verticalScrollbarSize: 6},
+  scrollbar: {horizontalScrollbarSize: 6, verticalScrollbarSize: 6, alwaysConsumeMouseWheel: false},
   scrollBeyondLastLine: false,
   automaticLayout: true,
 };