Tooltips have a black squares outside of its rounded corners

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

This happens because unity (compiz) doesn't advertize to support _GTK_FRAME_HINTS (as we don't), so gtk3 doesn't set up an rgba surface for tooltips and other client-side decorated windows (such as the ones with headerbar, to be fixed differently).

However in unity we do support rgba surfaces, and so to get proper transparent corners we need to force this.

This bug was fixed in the package gtk+3.0 - 3.16.7-0ubuntu4

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gtk+3.0 (3.16.7-0ubuntu4) xenial; urgency=medium

  * debian/patches/unity_rbga_tooltips.patch:
    - GtkTooltip: set always an rgba visual when running in Unity (LP: #1508357)

 -- Marco Trevisan (Treviño) <email address hidden> Fri, 30 Oct 2015 10:03:36 +0100

Hello Didier, or anyone else affected,

Accepted gtk+3.0 into wily-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/gtk+3.0/3.16.7-0ubuntu3.2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

Hello Didier, or anyone else affected,

Accepted gtk+3.0 into wily-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/gtk+3.0/3.16.7-0ubuntu3.3 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, and change the tag from verification-needed to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance!

The new gtk+3.0 from wily-proposed fixes this bug.

From today 16.04 have same problem

I'm also seeing this artifact again in Ubuntu 16.04, libgtk-3-0 3.18.9-1ubuntu3

Can't reproduce here on a "proposed" installation.

When using nvidia i have rounded corners with rounded swadows, but when using intel i have rounded corners with squares swadows.
Ubuntu 16.04

This bug was fixed in the package gtk+3.0 - 3.16.7-0ubuntu3.3

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gtk+3.0 (3.16.7-0ubuntu3.3) wily; urgency=medium

  * debian/patches/git_screenshot_hidpi.patch:
    - revert that change for now, it creates a regression

gtk+3.0 (3.16.7-0ubuntu3.2) wily; urgency=medium

  * debian/patches/git_non_uri_dnd_segfault.patch:
    - placessidebar: do not crash if uris is NULL, (lp: #1283426)
  * debian/patches/git_screenshot_hidpi.patch:
    - gdk_pixbuf_get_from_window: honor device scale, that fixes screenshots
      not looking right on hidpi screens, thanks Lars

gtk+3.0 (3.16.7-0ubuntu3.1) wily; urgency=medium

  * debian/patches/unity_rbga_tooltips.patch:
    - GtkTooltip: set always an rgba visual when running in Unity (LP: #1508357)

 -- Sebastien Bacher <email address hidden> Tue, 08 Dec 2015 15:32:58 +0100

The verification of the Stable Release Update for gtk+3.0 has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.