combo content: when the text is larger than non-text objects, vertical centering goes wonky
... it's possible to control line-height in such a way to repair centering

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but now setting height or min-height on toolbar breaks centering

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control height on children instead of toolbar

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it's possible to use a stent to effect min-height, but for unknown reasons, even a 0-width stent affects parent width

using img as stent node makes no difference
using negative margin on stent can approximate 0 width