78315faf8f
In #112326 the socket visibility functions were updated to take the open/closed state of panels into account for visibility of the socket icon. However, in "hidden" (collapsed) nodes the panels should be ignored entirely, drawing all sockets on the root level. This requires looking at the node flags to determine socket icon visibility, so a simple method of `bNodeSocket` is not sufficient. This patch moves the more complex visibility queries for sockets into `bNode`, where both node and socket flags can be accessed. These should be used for actual visibility rather than the plain flag accessors on `bNodeSocket`. Renamed `is_visible_or_panel_closed` back to just `is_visible`, the other `is_visible` variant is now integrated in `bNode::is_socket_drawn`. Pull Request: https://projects.blender.org/blender/blender/pulls/112520
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