Tutorials: fixes to buttons, in particualr back action

src/aare/gui/tutorials/tutorial_manager.py

@@ -218,7 +218,6 @@ class TutorialOverlay(QWidget):
         self.callout.setText("<br><br>".join(text_parts))
         self.callout.setMaximumWidth(460)
         self.callout.adjustSize()
-        self._position_callout(rect)
 
         self._waiting_for_click = bool(view.waiting_for_target_click)
 
@@ -234,6 +233,7 @@ class TutorialOverlay(QWidget):
 
         self.callout.show()
         self._position_end_button()
+        self._position_callout(rect)
         self._reposition_action_buttons()
         self.update()
 
@@ -434,7 +434,7 @@ class TutorialManager(QObject):
             self.context.event_log.append(event)
         return event
 
-    def get_current_step(self) -> TutorialStep | None:
+    def get_current_step(self) -> TutorialStepDefinition | None:
         if self.current_scenario is None or self.runtime_state is None:
             return None
 
@@ -533,7 +533,7 @@ class TutorialManager(QObject):
         self.step_changed.emit(self.current_scenario.id, step.id)
         self._try_auto_advance_current_step()
 
-    def _resolve_step_target(self, step: TutorialStep) -> ResolvedTutorialTarget | None:
+    def _resolve_step_target(self, step: TutorialStepDefinition) -> ResolvedTutorialTarget | None:
         if step.target is None or self.context is None:
             return None
         try:
@@ -659,7 +659,12 @@ class TutorialManager(QObject):
             return
         if not self.current_scenario.allow_back:
             return
-        self._advance_to_index(self.runtime_state.active_step_index - 1)
+
+        target_index = self.runtime_state.active_step_index - 1
+        if target_index < 0:
+            return
+
+        self._advance_to_index(target_index)
 
     def _on_skip_requested(self) -> None:
         step = self.get_current_step()