It's no need to hide spinner, because it's invisible when inactive.
Fixes resizes of menu bar when refresing/changing directory when "/Gdk/UnscaledDPI" is used in xsettings.
I have /Gdk/UnscaledDPI set to 81500 and /Gdk/WindowScalingFactor set to 2 which behaves like 170% scaling. Before the fix every directory change or refresh looks like this:
After fix: