glib-macros: Make main context the thread-default one in #[async_test]

Author: sdroege

glib-macros/src/async_test.rs

@@ -34,7 +34,7 @@ pub(crate) fn async_test(_args: TokenStream, mut item: TokenStream) -> TokenStre
     item_fn.block = syn::parse2(quote::quote! {
         {
             let main_ctx = glib::MainContext::new();
-            main_ctx.block_on(async #body)
+            main_ctx.with_thread_default(move || main_ctx.block_on(async #body))
         }
     })
     .expect("Body parsing failure");