move transition warning label and change default transition only once per scene change

src/advanced-scene-switcher.cpp

@@ -534,8 +534,9 @@ void handleSceneChange(SwitcherData *s)
 		s->PreviousScene2 = ws;
 	}
 
-	//reset autostart
+	//reset events only hanled on scene change
 	s->autoStartedRecently = false;
+	s->changedDefTransitionRecently = false;
 }
 
 void setLiveTime(SwitcherData *s)

src/headers/switcher-data-structs.hpp

@@ -93,6 +93,7 @@ struct SwitcherData {
 
 	std::deque<SceneTransition> sceneTransitions;
 	std::deque<DefaultSceneTransition> defaultSceneTransitions;
+	bool changedDefTransitionRecently = false;
 
 	std::deque<MediaSwitch> mediaSwitches;
 

src/switch-transitions.cpp

@@ -144,6 +144,9 @@ void AdvSceneSwitcher::on_defaultTransitionsDown_clicked()
 
 void SwitcherData::setDefaultSceneTransitions()
 {
+	if (changedDefTransitionRecently)
+		return;
+
 	obs_source_t *currentSource = obs_frontend_get_current_scene();
 	obs_weak_source_t *ws = obs_source_get_weak_source(currentSource);
 
@@ -167,6 +170,7 @@ void SwitcherData::setDefaultSceneTransitions()
 	}
 	obs_source_release(currentSource);
 	obs_weak_source_release(ws);
+	changedDefTransitionRecently = true;
 }
 
 void AdvSceneSwitcher::on_transitionOverridecheckBox_stateChanged(int state)
@@ -191,8 +195,10 @@ obs_weak_source_t *getNextTransition(obs_weak_source_t *scene1,
 			if (!t.initialized())
 				continue;
 
-			if (t.scene == scene1 && t.scene2 == scene2)
+			if (t.scene == scene1 && t.scene2 == scene2) {
 				ws = t.transition;
+				break;
+			}
 		}
 		obs_weak_source_addref(ws);
 	}