XFCE4-panel autohide delay

[Mike Jelt]

1)
System: Linux 5.11.0-25-generic x86_64 GNU/Linux
Distribution: XUbuntu 21.04

2)
package: xfce4-panel 4.16.2-1

xfce4-panel:
  Installiert: 4.16.2-1
  Installationskandidat: 4.16.2-1
  Versionstabelle:
 *** 4.16.2-1 500
        500 http://de.archive.ubuntu.com/ubuntu hirsute/universe amd64 Packages
        100 /var/lib/dpkg/status

3)
Bug: The setting "Hide always" in the panel does not work like expected.
There is a delay of 2 seconds before the panel hide-process starts (panel-animation of hiding).
Normally the time delay is nearly not noticeable.

4)
Description:
On a fresh installed XUbuntu 21.04 (or the live-system over a USB-Stick) I changed the panel settings from "hide never" to "hide always".
In this "hide-always-Mode" the panel is waiting for approx. 2 seconds till it starts to hide.

I want to set this hide-time to zero, but no success.

I could only set the animation-time for pop-up / pop-down to zero.
with: xfconf-query -n -c xfce4-panel -p /panels/panel-2/popdown-speed -t int -s 0

In the "Hide-auto-Mode" the panel disappear very fast. (But I need the hide-always-mode.)

In the sources* I could find a "autohide_timeout_id", this sounds like that the 2 seconds-delay could be set by this value, but I don't know how to change this value in my system.

* https://gitlab.xfce.org/xfce/xfce4-panel/-/blob/master/panel/panel-window.c

In XUbuntu 20.04 I did not had this problem with the panel.

[Mike Jelt (linuxmint-user)]

I found a solution.

Create a file:
 ~/.config/gtk-3.0/gtk.css

Put this text in it:
#XfcePanelWindow {
    -XfcePanelWindow-popup-delay: 0;
    -XfcePanelWindow-popdown-delay: 0;
}

Now the delay is gone.