Can't resize under a certain width with time slider on main toolbar

Using VLC 2.1.0 under Arch Linux x86_64

To reproduce: (with an empty ~/.config/vlc)

1/ Start VLC; Tools/Customize interface. Select profile "Simplest style" (this is just an easy/quick way to remove all buttons from the Time toolbar and Line 1 of the Main Toolbar)

2/ Add Time Slider in Line 2 of the Main Toolbar (position doesn't matter) (Note: does the same with only buttons in Line 1, it just looks ugly then w/ the extra blank space)

3/ Quit VLC; start it VLC.

Now the window has a (too large) fixed minimum width it won't go under, which for me seems to be about 660 pixels.

Removing it from the toolbar & restarting VLC allows to reduce the window again.