Probably related to https://bugzilla.xfce.org/show_bug.cgi?id=7845 (key press vs. key release).
** Bug watch added: Xfce Bugzilla #7845 https://bugzilla.xfce.org/show_bug.cgi?id=7845 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1812367 Title: Issuing right button click by xdotool does not work as expected Status in xdotool package in Ubuntu: New Status in xfce4-settings package in Ubuntu: New Status in xorg package in Ubuntu: New Bug description: 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. 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xdotool/+bug/1812367/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp