fix(core): fallback to {asset}/index.html before index.html, closes #2328 (#2329)

Author: amrbashir

Diff for: .changes/core-asset-fallback.md

@@ -0,0 +1,5 @@
+---
+"tauri": patch
+---
+
+Assets will now fallback to `<uri>/index.html` before `/index.html`, allowing anchor links to work as expected.

Diff for: core/tauri/src/manager.rs

@@ -353,6 +353,7 @@ impl<R: Runtime> WindowManager<R> {
 
         let asset_response = assets
           .get(&path.as_str().into())
+          .or_else(|| assets.get(&format!("{}/index.html", path.as_str()).into()))
           .or_else(|| {
             #[cfg(debug_assertions)]
             eprintln!("Asset `{}` not found; fallback to index.html", path); // TODO log::error!