Language protocol: fixed autocomplete insertion when language server answers with incomplete insertText

src/source_language_protocol.cc

@@ -1225,7 +1225,12 @@ void Source::LanguageProtocolView::setup_autocomplete() {
             auto detail=it->second.get<std::string>("detail", "");
             auto documentation=it->second.get<std::string>("documentation", "");
             auto insert=it->second.get<std::string>("insertText", "");
-            if(insert.empty()) {
+            if(!insert.empty()) { // In case ( is missing in insert but is present in label
+              auto pos=label.find('(');
+              if(pos!=std::string::npos && pos==insert.size() && pos+1<label.size() && label.back()==')' && insert.find('(')==std::string::npos)
+                insert+="(${1:"+label.substr(pos+1, label.size()-1-(pos+1))+"})";
+            }
+            else {
               insert=label;
               auto kind=it->second.get<unsigned>("kind", 0);
               if(kind>=2 && kind<=3) {