Just checked on my ubuntu gnome-shell session, with gedit & a short text file: 
does not see 'flashing' issue with a non scrollbar little text.
My system has 'proposed' archive enabled and use intel builtin video.

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Touch seeded packages, which is subscribed to gtk+3.0 in Ubuntu.

  gtk3.22 makes gedit & pluma screen flash for short text only

Status in gtk+3.0 package in Ubuntu:

Bug description:
  Environment: Ubuntu 18.04 development branch;
  GTK-3 version: 3.22;

  For almost all gtk3-based text editor, such as gedit, pluma, mousepad.
  There is textview flashing issue when the textview doesn't have its
  side-scrollbar. Typically, short text in textview can make this
  condition satisified.

  1) Editor textview flashing problem only happens in OS physical hosts,
  and doesn't happen when editors run inside Virtualbox.

  2) Editor textview flashing problem doesn't happen in Ubuntu 16.04
  which is of lower gtk3 version;

  3) If text document is long to generate either side of scrollbar for
  the editor textview, then the textview is no longer flashing.

  More to see: https://github.com/mate-desktop/pluma/issues/282
  Still, I just ensure that it is not a pluma issue but happens in all 
gtk3-based text editor including gedit.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: libgtk-3-0 3.22.28-1ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
  Uname: Linux 4.15.0-10-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Sat Feb 24 14:32:35 2018
  SourcePackage: gtk+3.0
  UpgradeStatus: No upgrade log present (probably fresh install)

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