*** This bug is a duplicate of bug 1767648 ***

I confirm the jumping problem. It seems to be a related to gnome
terminal. Using kitty or deepin terminal, I can have a program writing
text to the terminal continuously and not experience any jumps.

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  universal access zoom unusable

Status in gnome-shell package in Ubuntu:
Status in xorg package in Ubuntu:

Bug description:
  Filed by mark on behalf of low vision user Ken.   Ken is able to read 56 
point type without magnification at normal reading distance and can barely read 
the universal access "large text" from a distance of about 2.5 inches from a 
26inch monitor at 1360x768.   So he really needs magnification and a lot more 
than the 2x default I used here for testing.   We do not live in the same town 
so providing additional details would be slow.

  Turned on zoom from the universal access button on top panel.
  Default settings were used including Zoom = 2.0, screen part = full

  Several areas are corrupted.  These zoom and scroll separately from
  the rest of the screen and in a way that severely impairs use as
  portions may not ever be visible.   Portions of these subwindows
  cannot be used because you have to move the mouse off them to be able
  see them so you can either see or click but not both.

  These areas are:
    - The top panel
    - The left panel (launcher)  (intermittently)
    - pull down menus, particularly the universal access pull down from the top 

  Also, the zoom randomly every couple seconds. jumps to a different position 
without the user's consent.   This appeared to be because text was printed by a 
program running in the terminal window (long apt-get install) but continued to 
happen even when that window was minimized and even when that program stopped 

  These problems persisted with all the other zoom modes.   One mode,
  however, created new bugs.  With "magnifier extends outside of
  screen", you lose the ability to see the top and left panels at all;
  you can pan over where they would be but they are not drawn.   Can't
  open the pulldown menu since there is no icon, so who knows how it
  would be rendered.

  These bugs made it very difficult to get screenshots, especially with
  the defective screenshot program gnome-screenshot which ships with
  system.   Also, the bug-reporting program did not permitted attaching
  additional screenshots once spectacle was installed.

  Ubuntu 18.04, fresh install, only a few added packages (ham radio
  related, chrome).  Not using wayland, though a wayland session runs
  concurrently with X11 even though no one has logged in with wayland.

  Another problem in making the bug report is the irresponsible practice
  of failing to identify the software being used.   The accessability
  man in circle menu does not have a heading to tell you what program is
  run for the accessability menu or any of the functions thus invoked.
  Nor does the settings.  And there is no tooltip, popup, or about menu
  item to convey this information to the user.   And running a diff on
  ps doesn't show any new processes started when zoom is turned on.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu7
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Sat May  5 00:04:35 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
   NVIDIA Corporation G98 [GeForce 8400 GS Rev. 2] [10de:06e4] (rev a1) 
(prog-if 00 [VGA controller])
     Subsystem: Micro-Star International Co., Ltd. [MSI] G98 [GeForce 8400 GS 
Rev. 2] [1462:1163]
  InstallationDate: Installed on 2018-05-05 (0 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  MachineType: Dell Inc. OptiPlex 760
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic 
root=UUID=6a7e27f6-5135-461e-9e6b-fea68756ed37 ro quiet splash vt.handoff=1
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/29/2009
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: 0M858N
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.product.name: OptiPlex 760
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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