Add keyboard/gamepad focus navigation to dialog buttons

app/gui/NavigableMessageDialog.qml

@@ -15,7 +15,9 @@ NavigableDialog {
 
     onOpened: {
         // Force keyboard focus on the label so keyboard navigation works
-        dialogLabel.forceActiveFocus()
+        if (dialogButtonBox.count > 0) {
+            dialogButtonBox.itemAt(dialogButtonBox.count - 1).forceActiveFocus(Qt.TabFocus)
+        }
     }
 
     RowLayout {
@@ -52,18 +54,6 @@ NavigableDialog {
             // will cause word wrap to kick in.
             Layout.maximumWidth: 400
             Layout.maximumHeight: 400
-
-            Keys.onReturnPressed: {
-                accept()
-            }
-
-            Keys.onEnterPressed: {
-                accept()
-            }
-
-            Keys.onEscapePressed: {
-                reject()
-            }
         }
     }
 
@@ -71,6 +61,15 @@ NavigableDialog {
         id: dialogButtonBox
         standardButtons: dialog.standardButtons
 
+        delegate: Button {
+            flat: true
+
+            Keys.onReturnPressed: clicked()
+            Keys.onEnterPressed: clicked()
+            Keys.onRightPressed: nextItemInFocusChain(true).forceActiveFocus(Qt.TabFocus)
+            Keys.onLeftPressed: nextItemInFocusChain(false).forceActiveFocus(Qt.TabFocus)
+        }
+
         onHelpRequested: {
             Qt.openUrlExternally(helpUrl)
             close()