Fix check bugs for UI_combobox and UI_slider

src/UI/UI_combobox.cpp

@@ -18,14 +18,13 @@ UI_combobox::UI_combobox(const json& j)
 
 void UI_combobox::set_selected(size_t selected)
 {
-    if (selected != p_selected)
-    {
+    if (selected == p_selected)
+        return;
     p_selected = selected;
     if (p_on_change != nullptr)
     {
         p_on_change(p_id, selected_text());
     }
-    }
 }
 
 void UI_combobox::set_selected(std::string selected)

src/UI/UI_slider.cpp

@@ -14,6 +14,11 @@ UI_slider::UI_slider(const json& j)
 
 void UI_slider::set_value(double value)
 {
+    if (value < p_min || value > p_max)
+        return;
+    if (value == p_value)
+        return;
+
     if (p_on_change != nullptr)
     {
         this->p_value = value;