vastly improved audio

ui/colorbutton.cpp

@@ -16,23 +16,24 @@ QColor ColorButton::get_color() {
 
 void ColorButton::set_color(QColor c) {
     color = c;
+	set_button_color();
 }
 
 void ColorButton::set_button_color() {
     QPalette pal = palette();
     pal.setColor(QPalette::Button, color);
     setPalette(pal);
+	emit color_changed();
 }
 
 void ColorButton::open_dialog() {
     QColor old_color = color;
     QColor new_color = QColorDialog::getColor(color, NULL);
-    if (old_color != new_color) {
+	if (new_color.isValid() && old_color != new_color) {
         ColorCommand* command = new ColorCommand(this, old_color, new_color);
         undo_stack.push(command);
 
         set_button_color();
-        emit color_changed();
     }
 }