Preferences: Number of rows slider is longer than Row size and Length

$ xfce4-panel --version
xfce4-panel 4.14.3 (Xfce 4.14)

Greybird	Qogir

My knowledge of GTK3 is very limited. I tried inspecting xfce4-panel/panel/panel-preferences-dialog.glade but I can't find a difference that makes the GtkScale longer than the other 2.

This is also featured in this video at 2:49

Duplicate of #239 (closed)

closed

marked this issue as related to #239 (closed)

added 3. Duplicate label