Bug 1398531 - Toolbarbuttons are standardized with a min-height of 24px, but the zoom percentage button is text-only, thus needs a different treatment. r=Gijs

MozReview-Commit-ID: 3PEESkH7J7T

--HG--
extra : rebase_source : 0c3c033c6e2ae876dc001e70bda62f862f5738d2

browser/themes/shared/customizableui/panelUI.inc.css

@@ -1369,6 +1369,11 @@ photonpanelmultiview .PanelUI-subView .toolbaritem-combined-buttons > .subviewbu
   margin-inline-start: 10px;
 }
 
+/* An em-based minimum height works better for a text-only button. */
+#appMenu-zoomReset-button {
+  min-height: 2em;
+}
+
 #appMenu-zoomReset-button > .toolbarbutton-text {
   min-width: 3em;
   text-align: center;