manager: Add slot to (re-)apply managed values

src/calng/CalibrationManager.py

@@ -413,6 +413,13 @@ class CalibrationManager(DeviceClientBase, Device):
         self.state = State.CHANGING
         background(self._instantiate_pipeline())
 
+    @Slot(
+        displayedName='Apply managed values',
+        description='Set all managed keys to the values currently active on '
+                    'the manager, replacing any manual change.',
+        allowedStates=[State.ACTIVE])
+    async def applyManagedValues(self):
+        background(self._apply_managed_values())
 
     managed = Node(
         ManagedKeysNode,
@@ -1228,6 +1235,18 @@ class CalibrationManager(DeviceClientBase, Device):
         self._set_status('All devices instantiated')
         self.state = State.ACTIVE
 
+    async def _apply_managed_values(self):
+        """Apply all managed keys to local values."""
+
+        for daq_key, local_key in ManagedKeysNode.DAQ_KEYS.items():
+            await self._set_on_daq(
+                daq_key, get_property(self, f'managed.{local_key}'))
+
+        for key in self._managed_keys:
+            value = get_property(self, f'managed.{key}')
+            if not ismethod(value):
+                await self._set_on_corrections(key, value)
+
     def _call(self, device_ids, slot, *args):
         """Call the same slot on a list of devices."""