xdotool does not work well if launched by a shortcut

If I run 'xdotool click 3' as a keyboard shortcut (in Xfce at least) it does not work as a right button click unless I add short delay by sleep command in a script before running xdotool:

sleep 0.2
xdotool click 3

Supposedly it works even better, if I release the shortcut keybinding before the other command:

xdotool keyup super+space
xdotool click 3
(if the key-binding is super+space)

These could even be combined in single xdotool command:

xdotool sleep 0.2 click 3

and

xdotool keyup super+space click 3
(if the key-binding is super+space)

I think it would fix this, if the shortcut manager could handle the keyup part.

Related xdotool issues in Git:
https://github.com/jordansissel/xdotool/issues/42
https://github.com/jordansissel/xdotool/issues/210

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xdotool 1:3.20150503.1-2
ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
Uname: Linux 4.4.0-141-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Jan 18 11:29:52 2019
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-09-21 (1580 days ago)
InstallationMedia: Ubuntu-Studio 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.1)
SourcePackage: xdotool
UpgradeStatus: Upgraded to xenial on 2018-04-14 (279 days ago)