refactor: remove unneeded setscheme from actiongroup

src/Gui/QSint/actionpanel/actiongroup.cpp

@@ -60,14 +60,6 @@ void ActionGroup::init(bool hasHeader)
     connect(myHeader.get(), &TaskHeader::activated, this, &ActionGroup::showHide);
 }
 
-void ActionGroup::setScheme(ActionPanelScheme *scheme)
-{
-    myScheme = scheme;
-    myHeader->setScheme(scheme);
-    myGroup->setScheme(scheme);
-    update();
-}
-
 QBoxLayout* ActionGroup::groupLayout()
 {
     return myGroup->groupLayout();

src/Gui/QSint/actionpanel/actiongroup.h

@@ -74,14 +74,6 @@ public:
      */
     QBoxLayout* groupLayout();
 
-
-    /**
-     * @brief Sets the scheme for the panel and all its child groups.
-     *
-     * By default, `ActionPanelScheme::defaultScheme()` is used.
-     */
-    void setScheme(ActionPanelScheme *scheme);
-
     /**
      * @brief Checks if the group can collapse or expand.
      */

src/Gui/QSint/actionpanel/actionpanel.cpp

@@ -34,13 +34,6 @@ void ActionPanel::setScheme(ActionPanelScheme *scheme)
     myScheme = scheme;
     setStyleSheet(myScheme->actionStyle);
 
-    // Set scheme for children
-    for (QObject *obj : children()) {
-        if (auto *group = qobject_cast<ActionGroup*>(obj)) {
-            group->setScheme(scheme);
-        }
-    }
-
     update();
 }