controlled inline: onyx toolbar design

"inline" tests
combo content: when the text is larger than non-text objects, vertical centering goes wonky
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... 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
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using img as stent node makes no difference
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using negative margin on stent can approximate 0 width
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