fixed labelslider not appearing if set to 0

olive.pro.user

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 4.6.2, 2018-06-30T21:54:35. -->
+<!-- Written by QtCreator 4.6.2, 2018-07-01T03:51:18. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>

ui/labelslider.cpp

@@ -11,6 +11,7 @@ LabelSlider::LabelSlider(QWidget* parent) : QLabel(parent)
     max_enabled = false;
     setStyleSheet("QLabel{color:#ffc000;text-decoration:underline;}QLabel:disabled{color:#808080;}");
     setCursor(Qt::SizeHorCursor);
+    internal_value = -1;
     set_value(0);
     set_default_value(0);
 }