screen flashes while interaction in fullscreen

[dronus]

If darkttable is running fullscreen (F11) on Ubuntu 18.04 with my Thinpad T480s, there are annoying flashes of the screen in fullscreen mode on iteraction.

For example: If I adjust the base color curve while on fullscreen, the start and end of the mouse dragging the curves control points often result in brief (almost a single frame) white screen flash.

This is extremely disturbing when working in dim environments suitable for image processing.

The bug does not seem to occur if darktable is run in windowed mode.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: darktable 2.4.2-1
ProcVersionSignature: Ubuntu 5.0.0-31.33~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-31-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct 12 17:13:51 2019
EcryptfsInUse: Yes
InstallationDate: Installed on 2019-09-17 (24 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: darktable
UpgradeStatus: No upgrade log present (probably fresh install)

[Erich Eickmeyer (eeickmeyer)]

Cannot reproduce here. Has this problem persisted with newer versions of Darktable? Also, check to make sure you're not running on Wayland in 18.04.

[Launchpad Janitor (janitor)]

[Expired for darktable (Ubuntu) because there has been no activity for 60 days.]