diff --git a/ui/labelslider.cpp b/ui/labelslider.cpp
index d83b2b9f7..faef270bd 100644
--- a/ui/labelslider.cpp
+++ b/ui/labelslider.cpp
@@ -12,17 +12,17 @@
 LabelSlider::LabelSlider(QWidget* parent) : QLabel(parent) {
 	frame_rate = 30;
 	decimal_places = 1;
-    drag_start = false;
+	drag_start = false;
 	drag_proc = false;
-    min_enabled = false;
-    max_enabled = false;
+	min_enabled = false;
+	max_enabled = false;
 	set_color();
-    setCursor(Qt::SizeHorCursor);
-    internal_value = -1;
-    set = false;
-    display_type = LABELSLIDER_NORMAL;
+	setCursor(Qt::SizeHorCursor);
+	internal_value = -1;
+	set = false;
+	display_type = LABELSLIDER_NORMAL;
 
-    set_default_value(0);
+	set_default_value(0);
 }
 
 void LabelSlider::set_frame_rate(double d) {
@@ -35,23 +35,23 @@ void LabelSlider::set_display_type(int type) {
 }
 
 void LabelSlider::set_value(double v, bool userSet) {
-    set = true;
-    if (v != internal_value) {
-        if (min_enabled && v < min_value) {
-            internal_value = min_value;
-        } else if (max_enabled && v > max_value) {
-            internal_value = max_value;
-        } else {
-            internal_value = v;
-        }
+	set = true;
+	if (v != internal_value) {
+		if (min_enabled && v < min_value) {
+			internal_value = min_value;
+		} else if (max_enabled && v > max_value) {
+			internal_value = max_value;
+		} else {
+			internal_value = v;
+		}
 
 		setText(valueToString(internal_value));
-        if (userSet) emit valueChanged();
-    }
+		if (userSet) emit valueChanged();
+	}
 }
 
 bool LabelSlider::is_set() {
-    return set;
+	return set;
 }
 
 bool LabelSlider::is_dragging() {
@@ -71,7 +71,7 @@ QString LabelSlider::valueToString(double v) {
 }
 
 double LabelSlider::getPreviousValue() {
-    return previous_value;
+	return previous_value;
 }
 
 void LabelSlider::set_previous_value() {
@@ -84,11 +84,11 @@ void LabelSlider::set_color(QString c) {
 }
 
 double LabelSlider::value() {
-    return internal_value;
+	return internal_value;
 }
 
 void LabelSlider::set_default_value(double v) {
-    default_value = v;
+	default_value = v;
 	if (!set) {
 		set_value(v, false);
 		set = false;
@@ -96,83 +96,85 @@ void LabelSlider::set_default_value(double v) {
 }
 
 void LabelSlider::set_minimum_value(double v) {
-    min_value = v;
-    min_enabled = true;
+	min_value = v;
+	min_enabled = true;
 }
 
 void LabelSlider::set_maximum_value(double v) {
-    max_value = v;
-    max_enabled = true;
+	max_value = v;
+	max_enabled = true;
 }
 
 void LabelSlider::mousePressEvent(QMouseEvent *ev) {
-	drag_start_value = internal_value;
-	if (ev->modifiers() & Qt::AltModifier) {
-		if (internal_value != default_value && !qIsNaN(default_value)) {
-            set_previous_value();
-			set_value(default_value, true);
-		}
-    } else {
-		if (qIsNaN(internal_value)) internal_value = 0;
+	if (ev->buttons() & Qt::LeftButton) {
+		drag_start_value = internal_value;
+		if (ev->modifiers() & Qt::AltModifier) {
+			if (internal_value != default_value && !qIsNaN(default_value)) {
+				set_previous_value();
+				set_value(default_value, true);
+			}
+		} else {
+			if (qIsNaN(internal_value)) internal_value = 0;
 
-        qApp->setOverrideCursor(Qt::BlankCursor);
-        drag_start = true;
-        drag_start_x = cursor().pos().x();
-        drag_start_y = cursor().pos().y();
-    }
-	emit clicked();
+			qApp->setOverrideCursor(Qt::BlankCursor);
+			drag_start = true;
+			drag_start_x = cursor().pos().x();
+			drag_start_y = cursor().pos().y();
+		}
+		emit clicked();
+	}
 }
 
 void LabelSlider::mouseMoveEvent(QMouseEvent* event) {
-    if (drag_start) {
+	if (drag_start) {
 		drag_proc = true;
-        double diff = (cursor().pos().x()-drag_start_x) + (drag_start_y-cursor().pos().y());
-        if (event->modifiers() & Qt::ControlModifier) diff *= 0.01;
-        if (display_type == LABELSLIDER_PERCENT) diff *= 0.01;
-        set_value(internal_value + diff, true);
-        cursor().setPos(drag_start_x, drag_start_y);
-    }
+		double diff = (cursor().pos().x()-drag_start_x) + (drag_start_y-cursor().pos().y());
+		if (event->modifiers() & Qt::ControlModifier) diff *= 0.01;
+		if (display_type == LABELSLIDER_PERCENT) diff *= 0.01;
+		set_value(internal_value + diff, true);
+		cursor().setPos(drag_start_x, drag_start_y);
+	}
 }
 
 void LabelSlider::mouseReleaseEvent(QMouseEvent*) {
-    if (drag_start) {
-        qApp->restoreOverrideCursor();
-        drag_start = false;
-        if (drag_proc) {
+	if (drag_start) {
+		qApp->restoreOverrideCursor();
+		drag_start = false;
+		if (drag_proc) {
 			drag_proc = false;
 			previous_value = drag_start_value;
-            emit valueChanged();
+			emit valueChanged();
 		} else {
 			double d = internal_value;
 			if (display_type == LABELSLIDER_FRAMENUMBER) {
 				QString s = QInputDialog::getText(
 							this,
-                            tr("Set Value"),
-                            tr("New value:"),
+							tr("Set Value"),
+							tr("New value:"),
 							QLineEdit::Normal,
 							valueToString(internal_value)
 						);
-                if (s.isEmpty()) return;
+				if (s.isEmpty()) return;
 				d = timecode_to_frame(s, config.timecode_view, frame_rate); // string to frame number
 			} else {
-                bool ok;
+				bool ok;
 				d = QInputDialog::getDouble(
 							this,
-                            tr("Set Value"),
-                            tr("New value:"),
+							tr("Set Value"),
+							tr("New value:"),
 							(display_type == LABELSLIDER_PERCENT) ? internal_value * 100 : internal_value,
 							(min_enabled) ? min_value : INT_MIN,
 							(max_enabled) ? max_value : INT_MAX,
-                            decimal_places,
-                            &ok
+							decimal_places,
+							&ok
 						);
-                if (!ok) return;
-                if (display_type == LABELSLIDER_PERCENT) d *= 0.01;
+				if (!ok) return;
+				if (display_type == LABELSLIDER_PERCENT) d *= 0.01;
 			}
 			if (d != internal_value) {
-                set_previous_value();
+				set_previous_value();
 				set_value(d, true);
 			}
 		}
-    }
+	}
 }