message: Drag and Drop: Added support for drag and drop hold-long-to-open for CollapsingHeader() and TreeNode(). Open only!
diff: @@ -6671,6 +6671,8 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
  toggled |= IsMouseHoveringRect(interact_bb.Min, ImVec2(interact_bb.Min.x + text_offset_x, interact_bb.Max.y));
  if (flags & ImGuiTreeNodeFlags_OpenOnDoubleClick)
  toggled |= g.IO.MouseDoubleClicked[0];
  + if (g.DragDropActive && is_open) // We don't nodes to be highlighted when holding ever after the node has been opened, but don't close them!
  + toggled = false;
  if (toggled)
  {
  is_open = !is_open;
  