[ESS] readline with trailing space

[Jeremie Juste]

Hello,

I have noticed a behavior that I don't understand. When I call the
following function from the prompt.
test <- function(){
    a <- readline("selection: ")
    a
}

> test()
> selection: |
I can only type one character and the readline function exits before I can
press enter.

however

test1 <- function(){
    a <- readline("selection:")
    a
}
> test1()
> selection:|
works as expected.
> selection: abc[Ret]

However calling directly readline with a space in the prompt does what I
would expect.

> a <- readline("selection: ")
> selection: abc[Ret]
> a
> "abc"

It is the expected behavior or am I missing something?


I can reproduce this behavior on Windows and Linux.
I cannot reproduce this behavior in a bash terminal, or on RStudio.
I'm using ess-version: 18.10.3snapshot [elpa: 20200825.829] (loaded from
/home/djj/.emacs.d/elpa/ess-20200825.829/) but the problem still persist
in the latest version. 

Best regards.
-- 
Jeremie Juste