I think this was fixed in 18.04 recently, probably by:
https://launchpad.net/ubuntu/+source/ubuntu-themes/16.10+18.04.20180328-0ubuntu1
** Changed in: ubuntu-themes (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1717449
Title:
Titlebar height changes as buttons are added/removed
Status in ubuntu-themes package in Ubuntu:
Fix Released
Bug description:
Using Ambiance theme, the titlebar height changes as buttons are
added/removed. For example:
Settings > Devices > (click on the different options)
The Adwaita theme however has no such problem.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: light-themes 16.10+17.10.20170817-0ubuntu1
ProcVersionSignature: Ubuntu 4.12.0-13.14-generic 4.12.10
Uname: Linux 4.12.0-13-generic x86_64
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
Date: Fri Sep 15 15:07:09 2017
InstallationDate: Installed on 2017-05-03 (135 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170502)
PackageArchitecture: all
SourcePackage: ubuntu-themes
UpgradeStatus: No upgrade log present (probably fresh install)
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