Docking: Added ImGuiDockNodeFlags_NoDockingOverEmpty. Breaking definition of ImGuiDockNodeFlags_NoDockingOverOther which now means "non empty node". (#3492, #2648, #4292)
elseif((!host_node||!host_node->IsEmpty())&&root_payload_as_host&&root_payload_as_host->IsSplitNode()&&(root_payload_as_host->OnlyNodeWithWindows==NULL))// Is _visibly_ split?
elseif((!host_node||!host_node->IsEmpty())&&root_payload_as_host&&root_payload_as_host->IsSplitNode()&&(root_payload_as_host->OnlyNodeWithWindows==NULL))// Is _visibly_ split?