Issue #2267037 by vollepeer | michaelmol: Fixed Toolbar tab icons without title are not aligned.

core/modules/toolbar/css/toolbar.icons.css

@@ -209,6 +209,9 @@
 .no-svg .toolbar-icon-help.active:before {
   background-image: url("../../../misc/icons/000000/questionmark-disc.png");
 }
+.toolbar .toolbar-bar .toolbar-icon:before {
+  min-height: 3em;
+}
 
 @media only screen and (min-width: 16.5em) {
   .toolbar .toolbar-bar .toolbar-icon {