refactor: remove unneeded setscheme from taskgroup

src/Gui/QSint/actionpanel/taskgroup_p.cpp

@@ -22,8 +22,6 @@ TaskGroup::TaskGroup(QWidget *parent, bool hasHeader)
     setProperty("class", "content");
     setProperty("header", hasHeader ? "true" : "false");
 
-    setScheme(ActionPanelScheme::defaultScheme());
-
     QVBoxLayout *vbl = new QVBoxLayout();
     vbl->setContentsMargins(4, 4, 4, 4);
     vbl->setSpacing(0);
@@ -32,17 +30,6 @@ TaskGroup::TaskGroup(QWidget *parent, bool hasHeader)
     setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Maximum);
 }
 
-void TaskGroup::setScheme(ActionPanelScheme *scheme)
-{
-  if (scheme) {
-    myScheme = scheme;
-
-    setStyleSheet(myScheme->actionStyle);
-
-    update();
-  }
-}
-
 bool TaskGroup::addActionLabel(ActionLabel *label, bool addToLayout, bool addStretch)
 {
   if (!label)

src/Gui/QSint/actionpanel/taskgroup_p.h

@@ -26,8 +26,6 @@ class TaskGroup : public QFrame
 public:
   TaskGroup(QWidget *parent, bool hasHeader = false);
 
-  void setScheme(ActionPanelScheme *scheme);
-
   inline QBoxLayout* groupLayout()
   {
     return (QBoxLayout*)layout();