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Fixes #2192. Two problems here: 1. It's not documented but apparently we supported data frames for choices in updateSelectInput/updateSelectizeInput (it doesn't appear to work correctly for selectInput/selectizeInput though). This was used in 023-optgroup-server as well as by the user who reported #2172. 2. The example in 023-optgroup-server was also counting on the default value of optgroupLabelField, which (starting post-Shiny v1.1) was being set to a new default of "group". That now won't happen unless optgroupField is also blank. I'm less confident about the ramifications of this change. The selectize docs with the relevant bits are here: https://github.com/selectize/selectize.js/blob/master/docs/usage.md#data_searching