All it's doing is clearing the first editbox. It's still showing the last line entered from the active editbox, which is what the help file says it does.
In your example, the / is done from the second editbox, not the first because the second one is active.
it will show the last line you entered in that editbox
"that" means the current (active) editbox where the / was done. When you press F6, it's sending it from the active editbox. I'm not sure why you think it should be sending it from the inactive editbox.
That said, there is a bug either in the help file or in how it's working. It does not press enter. My guess is that it's because of how the / part works, but that should be explained better in the help file or else changed to work as you'd expect it to.
The -n switch fills the editbox and presses the enter key in the editbox.
You can test that with a single editbox and your alias. It will show the last text, but won't press enter. I think that may be where you're getting confused. It's clearing the first editbox, so you think it's pressing enter, but that part is working normally (though I don't know why it's clearing the first one). The issue is just that it doesn't press enter.
