Align dropdown in open project dialog

CURA-9424

plugins/3MFReader/WorkspaceDialog.qml

@@ -111,9 +111,8 @@ UM.Dialog
                         {
                             id: machineSelector
                             headerCornerSide: Cura.RoundedRectangle.Direction.All
-                            width: UM.Theme.getSize("machine_selector_widget").width
+                            width: parent.width
                             height: parent.height
-                            anchors.centerIn: parent
                             machineListModel: manager.updatableMachinesModel
                             machineName: manager.machineName
 
@@ -122,6 +121,8 @@ UM.Dialog
                             isCloudRegistered: false
                             isGroup: false
 
+                            minDropDownWidth: machineSelector.width
+
                             buttons: [
                                 Cura.SecondaryButton
                                 {

resources/qml/PrinterSelector/MachineSelector.qml

@@ -198,11 +198,14 @@ Cura.ExpandablePopup
         }
     }
 
+    property int minDropDownWidth: UM.Theme.getSize("machine_selector_widget_content").width
+    property int maxDropDownHeight: UM.Theme.getSize("machine_selector_widget_content").height
+
     contentItem: Item
     {
         id: popup
-        implicitWidth: Math.max(machineSelector.width, UM.Theme.getSize("machine_selector_widget_content").width)
-        implicitHeight: Math.min(machineSelectorList.contentHeight + separator.height + buttonRow.height, UM.Theme.getSize("machine_selector_widget_content").height) //Maximum height is the theme entry.
+        implicitWidth: Math.max(machineSelector.width, minDropDownWidth)
+        implicitHeight: Math.min(machineSelectorList.contentHeight + separator.height + buttonRow.height, maxDropDownHeight) //Maximum height is the theme entry.
         MachineSelectorList
         {
             id: machineSelectorList