From 08573fc96db564283f8580ae79de48085665f9dc Mon Sep 17 00:00:00 2001
From: Hyunjin Song <tteu.ingog@gmail.com>
Date: Mon, 30 Apr 2018 14:54:34 +0900
Subject: [PATCH] Fix detuning crash after deleting the note being edited
 (#4324)

---
 src/gui/editors/PianoRoll.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/gui/editors/PianoRoll.cpp b/src/gui/editors/PianoRoll.cpp
index dbec84357..888425ddc 100644
--- a/src/gui/editors/PianoRoll.cpp
+++ b/src/gui/editors/PianoRoll.cpp
@@ -31,6 +31,7 @@
 #include <QLayout>
 #include <QMdiArea>
 #include <QPainter>
+#include <QPointer>
 #include <QScrollBar>
 #include <QStyleOption>
 #include <QSignalMapper>
@@ -1334,8 +1335,8 @@ void PianoRoll::mousePressEvent(QMouseEvent * me )
 
 	if( m_editMode == ModeEditDetuning && noteUnderMouse() )
 	{
-		static AutomationPattern* detuningPattern = nullptr;
-		if (detuningPattern != nullptr)
+		static QPointer<AutomationPattern> detuningPattern = nullptr;
+		if (detuningPattern.data() != nullptr)
 		{
 			detuningPattern->disconnect(this);
 		}
@@ -1345,7 +1346,7 @@ void PianoRoll::mousePressEvent(QMouseEvent * me )
 			n->createDetuning();
 		}
 		detuningPattern = n->detuning()->automationPattern();
-		connect(detuningPattern, SIGNAL(dataChanged()), this, SLOT(update()));
+		connect(detuningPattern.data(), SIGNAL(dataChanged()), this, SLOT(update()));
 		gui->automationEditor()->open(detuningPattern);
 		return;
 	}