Feature request: selection-Bar to cancel and show current selections

Forwarding this request "for a Selection-Bar. You can see an example about Selection-Bar here. I am interested to help to do this feature but I need to understand a few things."

How would you implement Selection-Bar on Shiny? With Extension, other package or build it to the base package?

Good idea. The example looks great. I suggest you build a package for this feature. Here are a few examples of using packages as the extension: