[MD settings] checkbox ripple clipping with iron list

chrome/browser/resources/settings/languages_page/manage_languages_page.html

 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/cr.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-list/iron-list.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-checkbox/paper-checkbox.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="languages.html">
 
 <dom-module id="settings-manage-languages-page">
   <template>
     <style include="settings-shared">
       .list-frame {
+        align-items: initial;
         display: flex;
         flex-direction: column;
-        align-items: initial;
       }
 
       iron-list {
         height: 300px;
       }
+
+      .ripple-padding {
+        /* Create a little extra space for checkbox ink ripple to flow into. */
+        left: -20px;

[tommycli, 2016/06/25 00:31:34]

Is iron-list already position: relative? I thought left property had no effect
unless it was position relative, absolute, or fixed.

[dschuyler, 2016/06/28 19:16:13]

Yeah, it's here:

https://cs.chromium.org/chromium/src/third_party/polymer/v1_0/components-chro...

[tommycli, 2016/06/29 00:00:41]

Maybe add a TODO to investigate a better option?

+        padding-left: 20px;
+      }
     </style>
     <settings-languages languages="{{languages}}"></settings-languages>
     <div class="settings-box first block">
       <h2>$i18n{enabledLanguages}</h2>
       <div class="list-frame vertical-list">
         <template is="dom-repeat" items="{{languages.enabled}}">
           <div class="list-item">
             <div class="start" title="[[item.language.nativeDisplayName]]">
               [[item.language.displayName]]
             </div>
             <paper-icon-button icon="cr:clear"
                 on-tap="onRemoveLanguageTap_" hidden$="[[!item.removable]]">
             </paper-icon-button>
           </div>
         </template>
       </div>
       <h2>$i18n{allLanguages}</h2>
       <div class="list-frame vertical-list">
-        <iron-list items="{{languages.supported}}">
+        <iron-list class="ripple-padding" items="{{languages.supported}}">
           <template>
             <div class="list-item">
               <paper-checkbox
                   checked="[[isCheckboxChecked_(item, languages.enabled.*)]]"
                   disabled="[[isLanguageRequired_(item, languages.enabled.*)]]"
                   title$="[[item.nativeDisplayName]]"
                   on-change="onLanguageCheckboxChange_">
                 [[item.displayName]]
               </paper-checkbox>
             </div>
           </template>
         </iron-list>
       </div>
     </div>
   </template>
   <script src="manage_languages_page.js"></script>
 </dom-module>