Show hover link indicator in RoomWindow

BUG: 455019

src/qml/Page/RoomWindow.qml

@@ -25,5 +25,22 @@ Kirigami.ApplicationWindow {
 
     onCurrentRoomChanged: if (!currentRoom) {
         window.close()
+
+    property Item hoverLinkIndicator: QQC2.Control {
+        parent: overlay.parent
+        property string text
+        opacity: linkText.text.length > 0 ? 1 : 0
+
+        z: 20
+        x: 0
+        y: parent.height - implicitHeight
+        contentItem: QQC2.Label {
+            id: linkText
+            text: parent.text.startsWith("https://matrix.to/") ? "" : parent.text
+        }
+        Kirigami.Theme.colorSet: Kirigami.Theme.View
+        background: Rectangle {
+             color: Kirigami.Theme.backgroundColor
+        }
     }
 }