Highlight border flickers in Overview when you hover mouse away from & over window

[Jesse]

BEHAVIOR
When you enter activities overview, and hover your mouse over an open window (or away from an open window and then back over an open window) the border around the window flickers: it briefly fades, then returns. The border also flickers when you hover over the "X" close button at the top-right of a window in Overview, and then back to the window.

EXPECTED BEHAVIOR
That the blue border wouldn't flicker (or quickly fade out then fade back in) when you move the mouse into, over, or away from the window in Activities Overview.

BUG DISCOVERED USING
Ubuntu 17.10 beta 2
GNOME shell 3.26.1 (gnome-session package, vanilla gnome shell)
Nvidia 384.90 proprietary drivers
X.org 1.19.4
Linux kernel 4.13.0-15-generic

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/GNOME. If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status. Thanks in advance.

[Daniel van Vugt (vanvugt)]

Confirmed. Although in 17.10 the default theme uses an orange border, not blue.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jesse (jessedubord)]

@Daniel, thanks for the corrections.

I submitted an upstream bug to GNOME bugzilla, bug #789258.

https://bugzilla.gnome.org/show_bug.cgi?id=789258

[Sebastien Bacher (seb128)]

thanks for forwarding the issue

[Daniel van Vugt (vanvugt)]

I think this is fixed in Gnome 3.28 (Ubuntu 18.04). Can anyone else confirm?

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 17.10 (artful) reached end-of-life on July 19, 2018.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed.