Fix autocompletion

Now it will save a map from display name to id and use that to generate
clean matrix.to links. This also make sure the colors used for the
preview are correct by using NeoChatUser and fix the bug with the regex
by simply removing the regex.

imports/NeoChat/Component/ChatTextInput.qml

@@ -133,6 +133,7 @@ ToolBar {
             keyNavigationWraps: true
 
             delegate: Control {
+                readonly property string userId: modelData.id ?? ""
                 readonly property string displayText: modelData.displayName ?? modelData.unicode
                 readonly property bool isEmoji: modelData.unicode != null
                 readonly property bool highlighted: autoCompleteListView.currentIndex == index
@@ -437,13 +438,18 @@ 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() {
                     // Qt wraps lines so we need to use a small hack
                     // to remove the wrapped lines but not break the empty
                     // lines.
-                    const updatedText = inputField.text.trim()
-                        .replace(/@([^: ]*):([^ ]*\.[^ ]*)/, "[@$1:$2](https://matrix.to/#/@$1:$2)");
-                    documentHandler.postMessage(updatedText, attachmentPath, replyEventID);
+                    documentHandler.postMessage(inputField.text.trim(), attachmentPath, replyEventID,
+                        inputField.userAutocompleted);
                     clearAttachment();
                     currentRoom.markAllMessagesAsRead();
                     clear();
@@ -454,6 +460,9 @@ ToolBar {
 
                 function autoComplete() {
                     documentHandler.replaceAutoComplete(autoCompleteListView.currentItem.displayText)
+                    if (!autoCompleteListView.currentItem.isEmoji) {
+                        inputField.userAutocompleted[autoCompleteListView.currentItem.displayText] = autoCompleteListView.currentItem.userId;
+                    }
                 }
             }
 
@@ -543,6 +552,7 @@ ToolBar {
 
     function clear() {
         inputField.clear()
+        inputField.userAutocompleted = {};
     }
 
     function clearReply() {