fix(scan_control): ScanGroupBox enforce correct device combobox type in correct order

bec_widgets/widgets/control/scan_control/scan_group_box.py

@@ -271,9 +271,16 @@ class ScanGroupBox(QGroupBox):
                 continue
             if default == "_empty":
                 default = None
-            widget = widget_class(parent=self.parent(), arg_name=arg_name, default=default)
+            if widget_class is DeviceComboBox:
+                widget = widget_class(
+                    parent=self.parent(),
+                    arg_name=arg_name,
+                    default=default,
+                    device_filter=BECDeviceFilter.DEVICE,
+                )
+            else:
+                widget = widget_class(parent=self.parent(), arg_name=arg_name, default=default)
             if isinstance(widget, DeviceComboBox):
-                widget.set_device_filter(BECDeviceFilter.DEVICE)
                 self.selected_devices[widget] = ""
                 widget.device_selected.connect(self.emit_device_selected)
             if isinstance(widget, ScanLiteralsComboBox):

tests/unit_tests/test_device_input_widgets.py

@@ -37,6 +37,8 @@ def test_device_input_combobox_init(device_input_combobox):
     assert isinstance(device_input_combobox, DeviceComboBox)
     assert device_input_combobox.config.widget_class == "DeviceComboBox"
     assert device_input_combobox.isEditable() is True
+    assert device_input_combobox.currentText() == ""
+    assert device_input_combobox.is_valid_input is False
     assert device_input_combobox.config.device_filter == []
     assert device_input_combobox.config.readout_filter == [
         ReadoutPriority.MONITORED.value,

tests/unit_tests/test_scan_control.py

@@ -9,6 +9,7 @@ from qtpy.QtCore import QModelIndex, Qt
 
 from bec_widgets.utils.forms_from_types.items import StrFormItem
 from bec_widgets.utils.widget_io import WidgetIO
+from bec_widgets.widgets.control.device_input.device_combobox.device_combobox import DeviceComboBox
 from bec_widgets.widgets.control.scan_control import ScanControl
 
 from .client_mocks import mocked_client
@@ -304,6 +305,12 @@ def test_on_scan_selected(scan_control, scan_name):
             assert widget is not None  # Confirm that a widget exists
             expected_widget_type = scan_control.arg_box.WIDGET_HANDLER.get(arg_value, None)
             assert isinstance(widget, expected_widget_type)  # Confirm the widget type matches
+            if isinstance(widget, DeviceComboBox):
+                assert widget.currentText() == ""
+                assert "samx" in widget.devices
+                assert (
+                    "async_device" in widget.devices
+                )  # async device should also be present in the device list
 
     # Check kwargs boxes
     kwargs_group = [param for param in expected_scan_info["gui_config"]["kwarg_groups"]]