fix(composition): do not submit when user is composing

"composing" is used on Japanese (and other CJK scripts) when typing on a qwerty or similar keyboard, showing something akin to autocomplete on iOS. You confirm a word by pressing enter, which shouldn't commit to a search.

Still needs to be tested thoroughly, as it's possible we need to check isComposing earlier to prevent searching for the intermediate romanji characters.

Fixes algolia/docsearch#1304
Fixes algolia/docsearch#1043

packages/autocomplete-core/src/onKeyDown.ts

@@ -105,7 +105,7 @@ export function onKeyDown<TItem extends BaseItem>({
     // pending and could reopen the panel once they resolve, because that would
     // result in an unsolicited UI behavior.
     store.pendingRequests.cancelAll();
-  } else if (event.key === 'Enter') {
+  } else if (event.key === 'Enter' && !event.isComposing) {
     // No active item, so we let the browser handle the native `onSubmit` form
     // event.
     if (