** Description changed:

  I'm using 2 keyboards for gaming * and when i press a key on one of
  them, then press a key on the other (which happends some times per
  second, it's not rare at all) the game freezes a bit, something like
  100ms i guess. It's really incapaciting, i can't use XFCE as my daily DE
  because of this bug
  
- I'm pretty sure this bug comes from XFWM, because when i change it
+ I'm pretty sure this bug comes from XFWM, because when i change my WM
  (openbox --replace, for exemple), the bug is gone
  
  During my searches about this bug, i found one on Gnome which exactly looks 
like the one i'm describing : 
https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/1858
  It looks like a poor response to MappingNotify event (which indeed happends 
each time i have the freeze, when i press/release a key on a keyboard which is 
not the last keyboard which i pressed/released a key)
  
  * I don't really use 2 keyboards, but my mouse (Logitech G502), like
  many mouses with configurable additionnal buttons, is detected as a
  keyboard by the system, so nearly everytime i press on a mouse button,
  this bug happends
  
  Description:  Ubuntu 20.04.2 LTS
  Release:      20.04
  
  xfwm4:
-   Installé : 4.14.1-0ubuntu1
-   Candidat : 4.14.1-0ubuntu1
-  Table de version :
-  *** 4.14.1-0ubuntu1 500
-         500 http://fr.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
-         100 /var/lib/dpkg/status
+   Installé : 4.14.1-0ubuntu1
+   Candidat : 4.14.1-0ubuntu1
+  Table de version :
+  *** 4.14.1-0ubuntu1 500
+         500 http://fr.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
+         100 /var/lib/dpkg/status
  
  I expected no freeze when i use my keyboard or mouse
  
  Instead, each time i use my keyboard or mouse, my computer has a small
  freeze
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xfwm4 4.14.1-0ubuntu1
  ProcVersionSignature: Ubuntu 5.8.0-45.51~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-45-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: XFCE
  Date: Thu Apr  1 13:30:45 2021
  InstallationDate: Installed on 2021-03-10 (21 days ago)
  InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
  ProcEnviron:
-  LANGUAGE=fr_FR
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=fr_FR.UTF-8
-  SHELL=/bin/zsh
+  LANGUAGE=fr_FR
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=fr_FR.UTF-8
+  SHELL=/bin/zsh
  SourcePackage: xfwm4
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1922230

Title:
  small freezes when using multiple keyboards

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