There is no minimal verical size for the window, so you can resize it to just the title bar.

Put the summary of the bug you're having here

What I expected to happen was...:
The launcher would just resize to a small amount and stop resizing vertically, like most applications do.

What actually happened was...:
It resized till the end and all that was left was the title bar.

Steps to Reproduce:
1. Resize it verically all the way to the bottom

 

This does not occur while resizing horizontally. (it stops)

Here's a gif of it happening:

Edit 1: Fixed spelling mistake