List relevant side effects of leaving a room

Leaving a room is a big deal, yet we don't really inform the user all
that well. It's easy to leave a room that you have to be invited back
into, or lose access to history. If you're the only admin or room
creator, this becomes even more complex.

src/app/qml/ConfirmLeaveDialog.qml

@@ -8,13 +8,31 @@ import org.kde.kirigami as Kirigami
 
 import org.kde.neochat
 
+import Quotient
+
 Kirigami.PromptDialog {
     id: root
 
     required property NeoChatRoom room
 
     title: root.room.isSpace ? i18nc("@title:dialog", "Confirm Leaving Space") : i18nc("@title:dialog", "Confirm Leaving Room")
-    subtitle: root.room ? i18nc("Do you really want to leave <room name>?", "Do you really want to leave %1?", root.room.displayNameForHtml) : ""
+    subtitle: {
+        if (root.room) {
+            let message = xi18nc("@info Do you really want to leave <room name>?", "Do you really want to leave %1?", root.room.displayNameForHtml)
+
+            // List any possible side-effects the user needs to be made aware of.
+            if (root.room.historyVisibility !== "world_readable" && root.room.historyVisibility !== "shared") {
+                message += xi18nc("@info", "<br><strong>This room's history is limited to when you rejoin the room.</strong>")
+            }
+
+            if (root.room.joinRule === JoinRule.JoinRule.Invite) {
+                message += xi18nc("@info", "<br><strong>This room can only be rejoined with an invite.</strong>");
+            }
+
+            return message;
+        }
+        return "";
+    }
     dialogType: Kirigami.PromptDialog.Warning
 
     onRejected: {
@@ -28,7 +46,7 @@ Kirigami.PromptDialog {
             text: i18nc("@action:button", "Leave Room")
             QQC2.DialogButtonBox.buttonRole: QQC2.DialogButtonBox.AcceptRole
             icon.name: "arrow-left-symbolic"
-            onClicked: root.room.forget();
+            //onClicked: root.room.forget();
         }
     }
 }