2ce5fc4a3e
Prevent make links operator from creating links to sockets that are already linked to a muted link. The `SOCK_IS_LINKED` flag is used to check if there already is a link connecting to the socket but when the link is muted, the flag wasn't set leading to issues in parts of the code that used the flag to check for any type of connected link. This commit now also sets `SOCK_IS_LINKED` when links are muted and adds an additional check in places where different behavior is expected for muted links. Pull Request: https://projects.blender.org/blender/blender/pulls/108375
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