Some data points:
- I did not have .xinputrc
- still, GTK_IM_MODULE=xim in my sessions was set
- it seems im-config is responsible, selecting a different value via the 
Languages panel or im-config doesn't change anything
- removing im-config fixes this, but also removes ubuntu-desktop (it's a direct 
dependency)
- bringing im-config back makes it go bad again
- seems to be a per-user thing as one of my users now does not have the issue, 
new users do
- the following scripts seem to be involved:
  /etc/X11/Xsession.d/70im-config_launch
  /etc/profile.d/input-method-config.sh

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to ubuntu-themes in Ubuntu.
https://bugs.launchpad.net/bugs/1760818

Title:
  gedit and gnome-calculator transparency/graphics corruption issue

Status in mutter package in Ubuntu:
  Confirmed
Status in ubuntu-themes package in Ubuntu:
  Confirmed

Bug description:
  In a "Ubuntu" (Xorg) session on 18.04 gedit and gnome-calculator
  suffer from a graphics issue where parts of their windows hold parts
  of wallpaper or other windows' contents as background.

  See attached screenshot.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: light-themes 16.10+18.04.20180328-0ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Apr  3 09:12:31 2018
  PackageArchitecture: all
  SourcePackage: ubuntu-themes
  UpgradeStatus: Upgraded to bionic on 2018-02-07 (54 days ago)

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https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1760818/+subscriptions

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