Port away from deprecated QML features

app/qml/MprisSlider.qml

@@ -57,7 +57,7 @@ Loader {
 
     Connections {
         target: plugin
-        onNowPlayingChanged: {
+        function onNowPlayingChanged() {
             item.value = lastPosition
         }
     }

app/qml/mousepad.qml

@@ -61,9 +61,10 @@ Kirigami.Page
 
             Connections {
                 target: PointerLocker
-                onPointerMoved: {
-                    if (!PointerLocker.isLocked)
+                function onPointerMoved() {
+                    if (!PointerLocker.isLocked) {
                         return;
+                    }
                     mousepad.pluginInterface.moveCursor(Qt.point(delta.x, delta.y));
                 }
             }

declarativeplugin/qml/RemoteKeyboard.qml

@@ -20,13 +20,13 @@ TextField {
         pluginName: "remotekeyboard"
     }
 
-    property variant remoteKeyboard: null
+    property var remoteKeyboard: null
 
     readonly property bool remoteState: available ? remoteKeyboard.remoteState : false
 
     Connections {
         target: remoteKeyboard
-        onKeyPressReceived: {
+        function onKeyPressReceived() {
             //console.log("XXX received keypress key=" + key + " special=" + specialKey + " shift=" + shift + " ctrl=" + ctrl + " text=" + text + " cursorPos=" + cursorPosition);
             // interpret some special keys:
             if (specialKey == 12 || specialKey == 14)  // Return/Esc -> clear

smsapp/qml/MessageAttachments.qml

@@ -135,7 +135,7 @@ Item {
 
     Connections {
         target: conversationModel
-        onFilePathReceived: {
+        function onFilePathReceived() {
             if (root.uniqueIdentifier == fileName && root.sourcePath == "") {
                 root.sourcePath = "file:" + filePath