Bring back room subtitles

Show last appropriate room message/event as subtitle

harmonyqml/components/side_pane/utils.js

@@ -0,0 +1,42 @@
+.import "../chat/utils.js" as ChatJS
+
+
+function get_last_room_event_text(room_id) {
+    var eventsModel = Backend.models.roomEvents.get(room_id)
+
+    for (var i = -1; i >= -eventsModel.count; i--) {
+        var ev = eventsModel.get(i)
+
+        if (ev.type !== "RoomMemberEvent") {
+            var found = true
+            break
+        }
+    }
+
+    if (! found) { return "" }
+
+    var name          = Backend.getUser(ev.dict.sender).display_name
+    var undecryptable = ev.type === "OlmEvent" || ev.type === "MegolmEvent"
+
+    if (undecryptable || ev.type.startsWith("RoomMessage")) {
+        var color = ev.dict.sender === roomList.for_user_id ?
+                    "darkblue" : "purple"
+
+        return "<font color='" +
+               color +
+               "'>" +
+               name +
+               ":</font> " +
+               (undecryptable ?
+                "<font color='darkred'>Undecryptable<font>" :
+                ev.dict.body)
+   } else {
+       return "<font color='" +
+              (undecryptable ? "darkred" : "#444") +
+              "'>" +
+              name +
+              " " +
+              ChatJS.get_event_text(ev.type, ev.dict) +
+              "</font>"
+   }
+}