Update _potentially_dirty_states when adding explicit dependency

Ensure that fetching a dependency state causes dependent states to also be
fetched.

Author: masenf

reflex/vars/base.py

@@ -2488,12 +2488,18 @@ def add_dependency(self, objclass: type[BaseState], dep: Var):
                 var_name = all_var_data.field_name
                 if var_name:
                     self._static_deps.setdefault(state_name, set()).add(var_name)
-                    objclass.get_root_state().get_class_substate(
+                    target_state_class = objclass.get_root_state().get_class_substate(
                         state_name
-                    )._var_dependencies.setdefault(var_name, set()).add((
+                    )
+                    target_state_class._var_dependencies.setdefault(
+                        var_name, set()
+                    ).add((
                         objclass.get_full_name(),
                         self._name,
                     ))
+                    target_state_class._potentially_dirty_states.add(
+                        objclass.get_full_name()
+                    )
                     return
         msg = (
             "ComputedVar dependencies must be Var instances with a state and "

tests/units/test_state.py

@@ -4304,6 +4304,8 @@ class OtherState(rx.State):
     state = await mock_app.state_manager.get_state(_substate_key(token, OtherState))
     other_state = await state.get_state(OtherState)
     assert comp.State is not None
+    # The state should have been pre-cached from the dependency.
+    assert comp.State.get_name() in state.substates
     comp_state = await state.get_state(comp.State)
     assert comp_state.dirty_vars == set()