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Only Button Settings support 3 item controls #560
The following are missing: color-3, number-3, input-3, checkbox-3
I know that you are concerned about the 3 item control fitting nicely into the settings grid. Why don't you have these control following the 4 item control grid. But the last item is simply left blank.
Far too many times I have wanted a 3 item control but had to settle for creating 2-3 separate controls to do this. Or I come up with an extra number to configure just because.