Public bug reported:

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:
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)

** Affects: gtk+3.0 (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic

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

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