Bug 1766404 - Reduce the font size in Menulists in the Insert Character dialogue. r=aleca

Differential Revision: https://phabricator.services.mozilla.com/D144716

mail/components/compose/content/dialogs/EdInsertChars.xhtml

@@ -44,11 +44,11 @@
   <html:div class="grid-two-column-equalsize">
     <!-- value is set in JS from editor.properties strings -->
     <label id="LatinL_Label" control="LatinL" value="&letter.label;" accesskey="&letter.accessKey;"/>
-    <menulist class="larger" id="LatinL" oncommand="SelectLatinLetter()">
+    <menulist id="LatinL" oncommand="SelectLatinLetter()">
       <menupopup/>
     </menulist>
     <label id="LatinM_Label" control="LatinM" value="&character.label;" accesskey="&character.accessKey;"/>
-    <menulist class="larger" id="LatinM" oncommand="SelectLatinModifier()">
+    <menulist id="LatinM" oncommand="SelectLatinModifier()">
       <menupopup/>
     </menulist>
   </html:div>

mail/themes/windows/editor/EditorDialog.css

@@ -3,3 +3,10 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 @import url("chrome://messenger/skin/shared/EditorDialog.css");
+
+@media (-moz-windows-non-native-menus) {
+  menulist > menupopup > menuitem,
+  menulist > menupopup > menu {
+    padding-block: 0.2em;
+  }
+}