Proxy port and activity pin stay connected; activity parameter node is always stuck to the activity when moving #2542
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I added StickyAttachedHandleMove which can be registered to the items that once connected, can not be disconnected via dragging and can only be moved along the border.
I added this behavior to activity parameters (only dragging functionality; otherwise was already there inability to disconnect); pins (both input and output); proxyport.
PR Checklist
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PR Type
What kind of change does this PR introduce?
What is the current behavior?
Issue Number: #2484, #2450 (only point 3 from the initially proposed solution)
What is the new behavior?
Does this PR introduce a breaking change?
Other information
From the both related issues, not having free floating port/pin at all is not yet addressed - it is still possible to have free floating port/pin if it has never been attached to anything, but at least it is not possible to detach it anymore other than explicitly deleting.