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Using version 1.1.0-rc-1
In the documentation it states: To save space, buttons in toolbars are automatically set to inline styling so the button is only as wide as the text and icons it contains.
In v1.0.1, this was the case. After switching to 1.1.0-rc-1, I had to add data-inline="true" to keep the effect.
Fixed by bbe901d and subsequent commits.