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PR Type
What kind of change does this PR introduce?
What is the current behavior?
Replace the toolbar in the center of the diagram editor with something more sophisticated.
Issue Number: Fixes #3831
What is the new behavior?
A few functions end up in the header bar. The zoom buttons move to the lower-right corner.
Other information
By having the zoom buttons in the lower right corner, we can extend it and have a mini-map.