Fixes #464: fixed language client autocomplete for clangd server

src/source_language_protocol.cpp

@@ -1808,7 +1808,7 @@ void Source::LanguageProtocolView::setup_autocomplete() {
                 prefix = autocomplete->prefix;
               }
               for(auto &item : items) {
-                auto label = item.string_or("label", "");
+                auto label = item.string_or("filterText", item.string_or("label", ""));
                 if(starts_with(label, prefix)) {
                   auto detail = item.string_or("detail", "");
                   LanguageProtocol::Documentation documentation(item.child_optional("documentation"));