store stage instances on connect

src/discord/discord.cpp

@@ -1720,6 +1720,13 @@ void DiscordClient::ProcessNewGuild(GuildData &guild) {
         return;
     }
 
+    if (guild.StageInstances.has_value()) {
+        for (const auto &stage : *guild.StageInstances) {
+            m_stage_instances[stage.ID] = stage;
+            m_channel_to_stage_instance[stage.ChannelID] = stage.ID;
+        }
+    }
+
     m_store.BeginTransaction();
 
     m_store.SetGuild(guild.ID, guild);

src/discord/guild.cpp

@@ -54,6 +54,7 @@ void from_json(const nlohmann::json &j, GuildData &m) {
     JS_O("preferred_locale", m.PreferredLocale);
     JS_ON("public_updates_channel_id", m.PublicUpdatesChannelID);
     JS_O("max_video_channel_users", m.MaxVideoChannelUsers);
+    JS_ON("stage_instances", m.StageInstances);
     JS_O("approximate_member_count", tmp);
     if (tmp.has_value())
         m.ApproximateMemberCount = std::stol(*tmp);

src/discord/guild.hpp

@@ -4,6 +4,7 @@
 #include "role.hpp"
 #include "channel.hpp"
 #include "emoji.hpp"
+#include "stage.hpp"
 #include <vector>
 #include <string>
 #include <unordered_set>
@@ -90,6 +91,7 @@ struct GuildData {
     std::optional<int> ApproximateMemberCount;
     std::optional<int> ApproximatePresenceCount;
     std::optional<std::vector<ChannelData>> Threads; // only with permissions to view, id only
+    std::optional<std::vector<StageInstance>> StageInstances;
 
     // undocumented
     // std::map<std::string, Unknown> GuildHashes;