Buttons aren't properly themed in Radiance theme under HiDPI

This bug was fixed in the package ubuntu-themes - 16.10+18.10.20181005-0ubuntu1

---------------
ubuntu-themes (16.10+18.10.20181005-0ubuntu1) cosmic; urgency=medium

  [ Khurshid Alam ]
  * Remove nonexistent gnome-builder.css (LP: #1773045)

  [ Marco Trevisan (Treviño) ]
  * Radiance: fix typo in assets link for focused buttons (LP: #1781736)
  * Radiance: Use scaled image for buttons border (LP: #1781736)
  * Ambiance, Radiance: don't use padding on window buttons for chromium
    (LP: #1782038)
  * Ambiance: use default foreground color for toolbar menus (LP:
    #1758841)
  * Ambiance, Radiance: show proper arrow in combobox (LP: #1743373)
  * Ambiance, Radiance: use default disabled color for actions headerbar
    buttons (LP: #1785699)
  * Ambiace, Radiance: use headerbar destructive-action definition for
    buttons
  * Ambiance, Radiance: fix list selected color for gnome-boxes (LP:
    #1761684)
  * Ambiance, Radiance: properly theme disabled and hovered accelerators
    (LP: #1795895)

 -- Marco Trevisan (Treviño) <mail@3v1n0.net> Fri, 05 Oct 2018 00:13:07 +0000

Hello Harm, or anyone else affected,

Accepted ubuntu-themes into bionic-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/ubuntu-themes/16.10+18.04.20181005-0ubuntu1 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 on 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-bionic to verification-done-bionic. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-bionic. In either case, without details of your testing we will not be able to proceed.

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

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

Borders are properly themed and with right quality textures in this version:

$ apt-cache policy light-themes
light-themes:
  Installato: 16.10+18.04.20181004-0ubuntu1
  Candidato: 16.10+18.04.20181004-0ubuntu1

Same here:

marco@tricky:/tmp:✗ $ LC_ALL=C apt-cache policy light-themes
light-themes:
  Installed: 16.10+18.04.20181005-0ubuntu1
  Candidate: 16.10+18.04.20181005-0ubuntu1
  Version table:
 *** 16.10+18.04.20181005-0ubuntu1 100

This bug was fixed in the package ubuntu-themes - 16.10+18.04.20181005-0ubuntu1

---------------
ubuntu-themes (16.10+18.04.20181005-0ubuntu1) bionic; urgency=medium

  [ Khurshid Alam ]
  * Remove nonexistent gnome-builder.css (LP: #1773045)

  [ Marco Trevisan (Treviño) ]
  * Radiance: fix typo in assets link for focused buttons (LP: #1781736)
  * Radiance: Use scaled image for buttons border (LP: #1781736)
  * Ambiance, Radiance: don't use padding on window buttons for chromium
    (LP: #1782038)
  * Ambiance: use default foreground color for toolbar menus (LP:
    #1758841)
  * Ambiance, Radiance: show proper arrow in combobox (LP: #1743373)
  * Ambiance, Radiance: use default disabled color for actions headerbar
    buttons (LP: #1785699)
  * Ambiance, Radiance: fix list selected color for gnome-boxes (LP:
    #1761684)
  * Ambiance, Radiance: properly theme disabled and hovered accelerators
    (LP: #1795895)

 -- Marco Trevisan (Treviño) <mail@3v1n0.net> Fri, 05 Oct 2018 00:08:30 +0000

The verification of the Stable Release Update for ubuntu-themes 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.