Shaking off operators breaks connection if Operator has more than one output

[pixtur]

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[sosias]

Now I understand why shaking was enabled only for nodes without multi-input and output 😺 There are some challenges due to multi-input index order of removing / order of adding the new connections, undo / redo, multiple nodes selected on shaking...

I sent a pull request to show progress and see if I am in the right direction, but don't pull yet. There are still some bugs since there are multiple cases to cover.

The issues are related to the indexes of the multi-input connections, not only regarding shaking but in other parts of the code as well. I can try to look further into the structure and logic of multi-input to find a more robust solution.

[pixtur]

Ah yes... Multiinput indices are very complex. To be honest, most of that implementation has been done by @drcynic so I'm not really familiar with the details. But I will have a look at your PR.