From abcfee13343051002aa0cb42161254013868e64e Mon Sep 17 00:00:00 2001
From: tecknixia <50790262+tecknixia@users.noreply.github.com>
Date: Wed, 22 Apr 2020 13:47:59 -0500
Subject: [PATCH] disable drag after drawing line (#5315)

---
 include/AutomationEditor.h           |  1 +
 src/gui/editors/AutomationEditor.cpp | 14 +++++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/AutomationEditor.h b/include/AutomationEditor.h
index 60b894f1f..520416be8 100644
--- a/include/AutomationEditor.h
+++ b/include/AutomationEditor.h
@@ -240,6 +240,7 @@ private:
 
 	EditModes m_editMode;
 
+	bool m_mouseDownLeft;
 	bool m_mouseDownRight; //true if right click is being held down
 
 	TimeLineWidget * m_timeLine;
diff --git a/src/gui/editors/AutomationEditor.cpp b/src/gui/editors/AutomationEditor.cpp
index bf56e3039..048123ef5 100644
--- a/src/gui/editors/AutomationEditor.cpp
+++ b/src/gui/editors/AutomationEditor.cpp
@@ -96,6 +96,7 @@ AutomationEditor::AutomationEditor() :
 	m_y_delta( DEFAULT_Y_DELTA ),
 	m_y_auto( true ),
 	m_editMode( DRAW ),
+	m_mouseDownLeft(false),
 	m_mouseDownRight( false ),
 	m_scrollBack( false ),
 	m_barLineColor( 0, 0, 0 ),
@@ -539,6 +540,10 @@ void AutomationEditor::mousePressEvent( QMouseEvent* mouseEvent )
 				++it;
 			}
 
+			if (mouseEvent->button() == Qt::LeftButton)
+			{
+				m_mouseDownLeft = true;
+			}
 			if( mouseEvent->button() == Qt::RightButton )
 			{
 				m_mouseDownRight = true;
@@ -555,6 +560,7 @@ void AutomationEditor::mousePressEvent( QMouseEvent* mouseEvent )
 					drawLine( m_drawLastTick,
 							m_drawLastLevel,
 							pos_ticks, level );
+					m_mouseDownLeft = false;
 				}
 				m_drawLastTick = pos_ticks;
 				m_drawLastLevel = level;
@@ -657,6 +663,11 @@ void AutomationEditor::mouseReleaseEvent(QMouseEvent * mouseEvent )
 {
 	bool mustRepaint = false;
 
+	if (mouseEvent->button() == Qt::LeftButton)
+	{
+		m_mouseDownLeft = false;
+		mustRepaint = true;
+	}
 	if ( mouseEvent->button() == Qt::RightButton )
 	{
 		m_mouseDownRight = false;
@@ -742,7 +753,8 @@ void AutomationEditor::mouseMoveEvent(QMouseEvent * mouseEvent )
 
 		int pos_ticks = x * MidiTime::ticksPerBar() / m_ppb +
 							m_currentPosition;
-		if( mouseEvent->buttons() & Qt::LeftButton && m_editMode == DRAW )
+		// m_mouseDownLeft used to prevent drag when drawing line
+		if (m_mouseDownLeft && m_editMode == DRAW)
 		{
 			if( m_action == MOVE_VALUE )
 			{