Copy other user's matrix ID instead of room id for direct messages

Implements #469

src/neochatroom.cpp

@@ -1829,3 +1829,7 @@ int NeoChatRoom::maxRoomVersion() const
     }
     return maxVersion;
 }
+NeoChatUser *NeoChatRoom::directChatRemoteUser() const
+{
+    return dynamic_cast<NeoChatUser *>(connection()->directChatUsers(this)[0]);
+}

src/neochatroom.h

@@ -99,6 +99,7 @@ class NeoChatRoom : public Quotient::Room
      * Only returns main integer room versions (i.e. no msc room versions).
      */
     Q_PROPERTY(int maxRoomVersion READ maxRoomVersion NOTIFY maxRoomVersionChanged)
+    Q_PROPERTY(NeoChatUser *directChatRemoteUser READ directChatRemoteUser CONSTANT)
 
 public:
     enum MessageType {
@@ -330,6 +331,7 @@ public:
 #endif
 
     int maxRoomVersion() const;
+    NeoChatUser *directChatRemoteUser() const;
 
 private:
     QSet<const Quotient::RoomEvent *> highlights;

src/qml/Menu/RoomListContextMenu.qml

@@ -52,9 +52,11 @@ Loader {
             }
 
             QQC2.MenuItem {
-                text: i18nc("@action:inmenu", "Copy Address to Clipboard")
+                text: room.isDirectChat() ? i18nc("@action:inmenu", "Copy user's Matrix ID to Clipboard") : i18nc("@action:inmenu", "Copy Address to Clipboard")
                 icon.name: "edit-copy"
-                onTriggered: if (room.canonicalAlias.length === 0) {
+                onTriggered: if (room.isDirectChat()) {
+                    Clipboard.saveText(room.directChatRemoteUser.id)
+                } else if (room.canonicalAlias.length === 0) {
                     Clipboard.saveText(room.id)
                 } else {
                     Clipboard.saveText(room.canonicalAlias)