Upgrader's "New version available" window is way too high
Originally created by @intrigeri on #7234 (Redmine)
On a 1366x768 display, on a build from the devel branch, the height of the dialog that announces me that a new version is available (but I have to upgrade manually since I’ve started from a DVD) is about 120% of the screen’s height. The top part of the dialog is properly laid out, but there is tons of free space between it and the OK button.
Feature Branch: bugfix/7234-zenity-dialog-height