Fix edited replies

src/EventAccessors.cpp

@@ -264,6 +264,20 @@ struct EventRelations
         }
 };
 
+struct SetEventRelations
+{
+        mtx::common::Relations new_relations;
+        template<class Content>
+        using related_ev_id_t = decltype(Content::relations);
+        template<class T>
+        void operator()(mtx::events::Event<T> &e)
+        {
+                if constexpr (is_detected<related_ev_id_t, T>::value) {
+                        e.content.relations = std::move(new_relations);
+                }
+        }
+};
+
 struct EventTransactionId
 {
         template<class T>
@@ -426,6 +440,13 @@ mtx::accessors::relations(const mtx::events::collections::TimelineEvents &event)
         return std::visit(EventRelations{}, event);
 }
 
+void
+mtx::accessors::set_relations(mtx::events::collections::TimelineEvents &event,
+                              mtx::common::Relations relations)
+{
+        std::visit(SetEventRelations{std::move(relations)}, event);
+}
+
 std::string
 mtx::accessors::transaction_id(const mtx::events::collections::TimelineEvents &event)
 {

src/EventAccessors.h

@@ -55,6 +55,8 @@ std::string
 mimetype(const mtx::events::collections::TimelineEvents &event);
 mtx::common::Relations
 relations(const mtx::events::collections::TimelineEvents &event);
+void
+set_relations(mtx::events::collections::TimelineEvents &event, mtx::common::Relations relations);
 std::string
 transaction_id(const mtx::events::collections::TimelineEvents &event);
 

src/timeline/EventStore.cpp

@@ -414,7 +414,8 @@ EventStore::edits(const std::string &event_id)
         if (!original_event)
                 return {};
 
-        auto original_sender = mtx::accessors::sender(*original_event);
+        auto original_sender    = mtx::accessors::sender(*original_event);
+        auto original_relations = mtx::accessors::relations(*original_event);
 
         std::vector<mtx::events::collections::TimelineEvents> edits;
         for (const auto &id : event_ids) {
@@ -422,10 +423,20 @@ EventStore::edits(const std::string &event_id)
                 if (!related_event)
                         continue;
 
-                auto edit_rel = mtx::accessors::relations(*related_event);
+                auto related_ev = *related_event;
+
+                auto edit_rel = mtx::accessors::relations(related_ev);
                 if (edit_rel.replaces() == event_id &&
-                    original_sender == mtx::accessors::sender(*related_event))
-                        edits.push_back(*related_event);
+                    original_sender == mtx::accessors::sender(related_ev)) {
+                        if (edit_rel.synthesized && original_relations.reply_to() &&
+                            !edit_rel.reply_to()) {
+                                edit_rel.relations.push_back(
+                                  {mtx::common::RelationType::InReplyTo,
+                                   original_relations.reply_to().value()});
+                                mtx::accessors::set_relations(related_ev, std::move(edit_rel));
+                        }
+                        edits.push_back(std::move(related_ev));
+                }
         }
 
         auto c = cache::client();