How to recover from Tabs becoming their own Doc

I keep accidently moving a tab off the dock, and it becomes its own doc, but I have not figured out how to merge it back into the original dock. I keep having to make a new tab, drag all the icons over and then delete the 'new' dock'

 

1) How can prevent tabs from being taken off the dock?

2) How do I merge a new dock back into the old dock?

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