fix document naming and file dialogs preset, add touch scroll, flip thumbnail, scroll gesture and wheel for sidebar

engine/node_slider.h

@@ -7,6 +7,7 @@ class NodeSliderH : public NodeBorder
 public:
     glm::vec2 m_mask{ 1, 0 };
     glm::vec2 m_value;
+    glm::vec2 m_old_value;
     std::function<void(Node* target, float value)> on_value_changed;
     virtual Node* clone_instantiate() const override;
     virtual void clone_copy(Node* dest) const override;