When leaving room, try to go to previous page

src/qml/Chat/Chat.qml

@@ -21,7 +21,11 @@ HPage {
 
     onRoomInfoChanged: {
         if (roomInfo.left) {
-            // If left, the room will most likely be gone on client restart
+            // If left, the room will most likely be gone on client restart.
+            // Try to switch back to the previous page.
+            if (pageLoader.showPrevious()) return
+
+            // If there wasn't any previous page, show default page.
             window.uiState.page           = "Pages/Default.qml"
             window.uiState.pageProperties = {}
             window.uiStateChanged()

src/qml/UI.qml

@@ -134,7 +134,7 @@ Item {
 
             function showPrevious(timesBack=1) {
                 timesBack = Math.min(timesBack, history.length - 1)
-                if (timesBack < 1) return
+                if (timesBack < 1) return false
 
                 let [componentUrl, properties] = history[timesBack]
 
@@ -143,6 +143,7 @@ Item {
                 window.uiState.page           = componentUrl
                 window.uiState.pageProperties = properties
                 window.uiStateChanged()
+                return true
             }
 
             onStatusChanged: if (status == Loader.Ready) {