DevTools: fix blackboxing buttons

third_party/WebKit/Source/devtools/front_end/ui/listWidget.css

 /*
  * Copyright 2015 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 .list {
     flex: auto 0 1;
     overflow-y: auto;
     border: 1px solid rgb(231, 231, 231);
@@ skipping 32 matching lines @@
 .list-item:hover .controls-gradient {
     background-image: linear-gradient(90deg, transparent, hsl(0, 0%, 96%));
 }
 
 .controls-buttons {
     flex: none;
     display: flex;
     flex-direction: row;
     align-items: center;
     pointer-events: auto;
+    visibility: hidden;
 }
 
 .list-item:hover .controls-buttons {
     background-color: hsl(0, 0%, 96%);
-}
-
-.remove-button,
-.edit-button {
-    opacity: 0.5;
-    cursor: pointer;
-    flex: none;
-    visibility: hidden;
-}
-
-.list-item:hover .remove-button,
-.list-item:hover .edit-button {
     visibility: visible;
 }
 
-.remove-button:hover,
-.edit-button:hover {
-    opacity: 0.7;
-}
-
-.remove-button {
-    background-position: -128px -24px;
-}
-
-.edit-button {
-    background-position: -160px 0px;
-}
-
 .editor-container {
     display: flex;
     flex-direction: column;
     align-items: stretch;
     flex: none;
     background: hsl(0, 0%, 96%);
     overflow: hidden;
 }
 
 .editor-content {
@@ skipping 17 matching lines @@
     margin-right: 10px;
 }
 
 .editor-content input {
     margin-right: 10px;
 }
 
 .editor-content input.error-input {
     background-color: white;
 }