🎉 FINALLY! Extra window in any wayland compositor

This required switching from a QML Window to a QQuickView in C++. I
want to try to eventually subclass that in Rust, but for now it works.

I'll have to still tinker with this to find out how to specifically
set the screen in certain environments, but for now the user will need
to move the window on their own.

src/qml/presenter/Settings.qml

@@ -20,6 +20,7 @@ Kirigami.OverlaySheet {
     /* } */
 
     Kirigami.FormLayout {
+        implicitHeight: Kirigami.Units.gridUnit * 30
 	Controls.ComboBox {
 	    id: screenSelectionField
 	    Kirigami.FormData.label: i18nc("@label:textbox", "Presentation Screen:")
@@ -27,6 +28,31 @@ Kirigami.OverlaySheet {
             textRole: "name"
 	    onActivated: {
                 presentationScreen = screens[currentIndex];
+                console.log(PresWindow.screen);
+                PresWindow.screen = screens[currentIndex];
+                console.log(PresWindow.screen);
+            }
+
+            popup: Controls.Popup {
+                y: screenSelectionField.height + 10
+                z: 1000
+                width: screenSelectionField.width
+                implicitHeight: contentItem.implicitHeight
+                padding: 1
+
+                contentItem: ListView {
+                    clip: true
+                    implicitHeight: contentHeight
+                    model: screenSelectionField.popup.visible ? screenSelectionField.delegateModel : null
+                    currentIndex: screenSelectionField.highlightedIndex
+
+                    Controls.ScrollIndicator.vertical: Controls.ScrollIndicator { }
+                }
+
+                background: Rectangle {
+                    border.color: Kirigami.Theme.hoverColor
+                    radius: 2
+                }
             }
 	}
         Controls.ToolButton {