no interoperability with shiny

I am using ggtern with shiny in cocktailApp (on CRAN). The received wisdom from https://github.com/rstudio/shiny/issues/915 is that a ggtern plot handle should not be returned from a call to renderPlot, rather one should print() the handle and return NULL. That is, I have been using:

output$tern_plot <- renderPlot({
ph <- make_ggtern_plot( ... )
print(ph)
NULL
})

I think I made some upgrades to packages in my system and this now throws odd errors of the form

Error: unused argument (<environment>)

If I return the plot handle via

output$tern_plot <- renderPlot({
ph <- make_ggtern_plot( ... )
ph
})

the ternary plot does not look right: no grid lines, the axis labels are wrong, etc. The ticket 915 suggested that ggtern should not overload print.ggplot or build_gtable. That's a bit over my head.

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