Collapsed appfinder window not resizable at window scaling 2x

Hi all,

I noticed a curious issue with xfce4-appfinder after migrating to a HiDPI monitor. When window scaling (Settings → Appearance → Settings) is set to 2x, starting the app finder in collapsed mode yields a very narrow and non-resizable finder window. After setting window scaling to 1x, the issue disappears and the window is resizable again. This is not contingent on the attached monitor — I can reproduce the issue on my 1080p laptop screen alone.

Window @ 1x scaling:

Window @ 2x scaling (notice missing maximize button):

xfce4-appfinder version: 4.16.1