Improve sending message with mentions

* Fix bug with reply having broken mentions (@$1:$2)
* Fix mentions disapearing from edited messages
* Fix formatting disapearing from edited messages

imports/NeoChat/Component/ChatTextInput.qml

@@ -469,14 +469,9 @@ ToolBar {
                         autoCompleteEndPosition = cursorPosition
                     }
 
-                    // store each user we autoComplete here, this will be helpful later to generate
-                    // the matrix.to links.
-                    // This use an hack to define: https://doc.qt.io/qt-5/qml-var.html#property-value-initialization-semantics
-                    property var userAutocompleted: ({})
-
                     function postMessage() {
                         roomManager.actionsHandler.postMessage(inputField.text.trim(), attachmentPath,
-                            replyEventID, editEventId, inputField.userAutocompleted);
+                            replyEventID, editEventId);
                         clearAttachment();
                         currentRoom.markAllMessagesAsRead();
                         clear();
@@ -487,10 +482,6 @@ ToolBar {
 
                     function autoComplete() {
                         documentHandler.replaceAutoComplete(autoCompleteListView.currentItem.displayText)
-                        // Unfortunally it doesn't
-                        if (!autoCompleteListView.currentItem.isEmoji) {
-                            inputField.userAutocompleted[autoCompleteListView.currentItem.displayText] = autoCompleteListView.currentItem.userId;
-                        }
                     }
                 }
             }
@@ -583,7 +574,6 @@ ToolBar {
 
     function clear() {
         inputField.clear()
-        inputField.userAutocompleted = {};
     }
 
     function clearEditReply() {