Fix crash when deleting last macro

A crash could occur if the last macro was deleted and the highlighting
of macro segments was enabled due to the macro segments already being
deleted while the widgets representing these segments were not

src/macro-action-edit.cpp

@@ -220,11 +220,11 @@ void AdvSceneSwitcher::RemoveMacroAction(int idx)
 
 	{
 		std::lock_guard<std::mutex> lock(switcher->m);
+		actionsList->Remove(idx);
 		macro->Actions().erase(macro->Actions().begin() + idx);
 		switcher->abortMacroWait = true;
 		switcher->macroWaitCv.notify_all();
 		macro->UpdateActionIndices();
-		actionsList->Remove(idx);
 		SetActionData(*macro);
 	}
 	MacroActionSelectionChanged(-1);

src/macro-condition-edit.cpp

@@ -437,13 +437,13 @@ void AdvSceneSwitcher::RemoveMacroCondition(int idx)
 
 	{
 		std::lock_guard<std::mutex> lock(switcher->m);
+		conditionsList->Remove(idx);
 		macro->Conditions().erase(macro->Conditions().begin() + idx);
 		macro->UpdateConditionIndices();
 		if (idx == 0 && macro->Conditions().size() > 0) {
 			auto newRoot = macro->Conditions().at(0);
 			newRoot->SetLogicType(LogicType::ROOT_NONE);
 		}
-		conditionsList->Remove(idx);
 		SetConditionData(*macro);
 	}
 	MacroConditionSelectionChanged(-1);

src/macro-tab.cpp

@@ -98,12 +98,13 @@ void AdvSceneSwitcher::on_macroRemove_clicked()
 	if (!item) {
 		return;
 	}
+	int idx = ui->macros->currentRow();
+	delete item;
 	QString name;
 	{
 		std::lock_guard<std::mutex> lock(switcher->m);
 		switcher->abortMacroWait = true;
 		switcher->macroWaitCv.notify_all();
-		int idx = ui->macros->currentRow();
 		QString::fromStdString(switcher->macros[idx]->Name());
 		switcher->macros.erase(switcher->macros.begin() + idx);
 		for (auto &m : switcher->macros) {
@@ -111,8 +112,6 @@ void AdvSceneSwitcher::on_macroRemove_clicked()
 		}
 	}
 
-	delete item;
-
 	if (ui->macros->count() == 0) {
 		ui->macroHelp->setVisible(true);
 	}
@@ -360,6 +359,10 @@ void AdvSceneSwitcher::on_macros_currentRowChanged(int idx)
 
 	if (idx == -1) {
 		SetMacroEditAreaDisabled(true);
+		conditionsList->Clear();
+		actionsList->Clear();
+		conditionsList->SetHelpMsgVisible(true);
+		actionsList->SetHelpMsgVisible(true);
 		return;
 	}