Just to add that Ralf responded extremely quickly to a feature request on UniversalButton (in a week!) - now the SVG icon can be positioned anywhere with LC-like control (i.e. gravity) and resized with a slider, making it very similar to FileMaker Pro buttons, for those of us who were missing the easy functionality of such things in FMP.
His repository on gitHub is:
https://github.com/revig/universal-button-widget
Highly recommended!
How to draw a rectangle with only two rounded corners?
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