Tag editor design question

After adding a tag to a resource the tag editor is left in the state shown below (5.2a Beta 3 on Windows 8.1)

From this point it is easy to add additional tags but it isn't clear how one is supposed to exit the editor and to commit the changes.

My initial assumption was that pressing the enter key again would complete this but it doesn't

I have found that left-clicking the mouse outside of the edit box completes the action as does pressing the Escape key.

From a design perspective how is one supposed to complete the process of adding tags?

Thanks, Graham 

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