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

engine/node_color_quad.cpp

@@ -42,6 +42,7 @@ kEventResult NodeColorQuad::handle_event(Event* e)
     {
     case kEventType::MouseDownL:
     {
+        m_old_value = m_value;
         dragging = true;
         mouse_capture();
         auto sz = GetSize();
@@ -67,6 +68,14 @@ kEventResult NodeColorQuad::handle_event(Event* e)
                 on_value_changed(this, m_value);
         }
         break;
+    case kEventType::MouseCancel:
+        mouse_release();
+        dragging = false;
+        m_value = m_old_value;
+        set_value(m_value.x, m_value.y);
+        if (on_value_changed)
+            on_value_changed(this, m_value);
+        break;
     default:
         return kEventResult::Available;
         break;