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

engine/node_slider.cpp

@@ -74,6 +74,7 @@ kEventResult NodeSliderH::handle_event(Event* e)
         dragging = true;
         mouse_capture();
         {
+            m_old_value = m_value;
             auto sz = GetSize();
             auto pos = glm::clamp(((MouseEvent*)e)->m_pos - m_pos, { 0, 0 }, sz) * m_mask;
             m_value = pos / glm::max({ 1, 1 }, sz);
@@ -95,6 +96,14 @@ kEventResult NodeSliderH::handle_event(Event* e)
                 on_value_changed(this, glm::length(m_value));
         }
         break;
+    case kEventType::MouseCancel:
+        mouse_release();
+        dragging = false;
+        m_value = m_old_value;
+        set_value(glm::length(m_value));
+        if (on_value_changed)
+            on_value_changed(this, glm::length(m_value));
+        break;
     default:
         return kEventResult::Available;
         break;