Fix rsx autocomplete and diagnostics in the root; provide better completions after attributes are finished (#2656)

* fix rsx autocomplete and diagnostics in the root; provide better completions after attributes are finished

* clean up pr to use internal child parsing

* Fix peek_lowercase name

* fix comma diagnostics in the root

* Fix parsing components with a path

* remove simple routes trailing comma

* Fix incomplete_root_elements test

* Remove trailing commas from root body node in tests

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/rsx/src/node.rs

@@ -7,7 +7,7 @@ use quote::ToTokens;
 use syn::{
     parse::{Parse, ParseStream},
     spanned::Spanned,
-    token::{self, Brace},
+    token::{self},
     Ident, LitStr, Result, Token,
 };
 
@@ -76,16 +76,17 @@ impl Parse for BodyNode {
             return Ok(BodyNode::Element(stream.parse::<Element>()?));
         }
 
-        // this is an Element if path match of:
+        // this is an Element if the path is:
         //
         // - one ident
-        // - followed by `{`
         // - 1st char is lowercase
         // - no underscores (reserved for components)
+        // And it is not:
+        // - the start of a path with components
         //
         // example:
         // div {}
-        if stream.peek(Ident) && stream.peek2(Brace) {
+        if stream.peek(Ident) && !stream.peek2(Token![::]) {
             let ident = stream.fork().parse::<Ident>().unwrap();
             let el_name = ident.to_string();
             let first_char = el_name.chars().next().unwrap();