Behaviour of brush parameter resetOnNew not clear to me

I do not fully understand, when resetOnNew=FALSE does actually inhibit the reset of the brush on redraw.

In my question r - brush in shiny is resetting despite resetOnNew=FALSE. What can I do about it? - Stack Overflow it says that changing the data always resets the graph.

What does that actually mean? I can somehow understand that the plot brush resets with a new aes value of x and y or with new coord_cartesian, but why is even a change of alpha or size resetting the brush? Is this a wanted behaviour or a bug?

Here you have a reprex:


ui <- fluidPage(
  plotOutput("po1", brush = brushOpts(
    direction = "x"
  textInput("ti", "Title")

server <- function(input, output, session) {
  output$po1 <- renderPlot({
    pdlong <- pivot_longer(iris[1:4], !Sepal.Width)
    if (input$ti!=""){
      return(ggplot(pdlong)+geom_point(aes(x=Sepal.Width, y=value, alpha=as.numeric(name=="Petal.Length")))+scale_alpha_identity()+ggtitle(input$ti))
    } else {
      return(ggplot(pdlong)+geom_point(aes(x=Sepal.Width, y=value, alpha=as.numeric(name=="Petal.Width")))+scale_alpha_identity())
  }, ignoreNULL = FALSE)

shinyApp(ui, server)

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