type histogram hc_tooltip oddities

[grcatlin]

For some reason, sort = T must be enabled to edit the tooltip for hcharts of type histogram. I'm not sure if this is intended, but took me quite a long time to figure this one out.

hchart(c(1:100)) %>% 
  hc_tooltip(headerFormat = "",
             pointFormat = "")

This code still shows the tooltip which should be present, but blank:

hchart(c(1:100)) %>% 
  hc_tooltip(headerFormat = "",
             pointFormat = "",
             sort = T)

This code performs like I thought the first would:

[stale]

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