Channel Followup: avoid setting an invisible gm as Channel owner (#17597)

* Core/Chat: avoid setting an invisible gm (as in .gm visible off) as channel owner, giving it away to other players.

- This can now only happen if the channel is empty or every other member is an invisible gm, too.

Fixes #17424

* Feedback based changes

1 files changed, 3 insertions, 0 deletions

diff --git a/src/server/game/Entities/Player/Player.cpp b/src/server/game/Entities/Player/Player.cpp
index dce0d9b6ad7..e2f6686aae0 100644
--- a/src/server/game/Entities/Player/Player.cpp
+++ b/src/server/game/Entities/Player/Player.cpp
@@ -2609,6 +2609,9 @@ void Player::SetGMVisible(bool on)
 
         m_serverSideVisibility.SetValue(SERVERSIDE_VISIBILITY_GM, GetSession()->GetSecurity());
     }
+
+    for (Channel* channel : m_channels)
+        channel->SetInvisible(this, !on);
 }
 
 bool Player::IsGroupVisibleFor(Player const* p) const