I would say remove Yaru here. The theme can't directly control whether the dialog is too small and needs wrapping. Although it can control the dialog size indirectly with some tweaks, but doing that would be a hack.
I think this is a pure Gnome Shell bug. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1809788 Title: Shell dialog messages are truncated and ellipsized... Status in GNOME Shell: Unknown Status in OEM Priority Project: Confirmed Status in gnome-shell package in Ubuntu: Triaged Status in yaru-theme package in Ubuntu: Triaged Status in gnome-shell source package in Bionic: Triaged Bug description: When plugging in a Thunderbolt device, under certain conditions, there could be a pop-up window asking for authentication from the user. In the dialog box, the prompt text is truncated. Please refer to attached screen shot for more details. The issue can be found in the gnome-control-center package for bionic: 1:3.28.2-0ubuntu0.18.04.2 1:3.28.1-0ubuntu1 However, the issue is confirmed to be gone in latest such package for Cosmic: 1:3.30.2-1ubuntu0.18.10.1 To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1809788/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

