Rounded corners if pannel lenght is < 100

[alxgvr]

Hi. I use panel length 90% and auto hide. So, I can close maximized windows without triggering appear action.

Issue is - panel in this mode has ugly right angle corners (90) which are not fitting Gnome aesthetics.
Please, add option to set how rounded corners should be. I want panel to have exact roundness as gnome extensions on panel.