[DevTools] Color values should be case insensitive while suggestions should be case aware

Source/devtools/front_end/ui/TextPrompt.js

 /*
  * Copyright (C) 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 454 matching lines @@
         if (this._suggestBox)
             this._suggestBox.updateSuggestions(this._boxForAnchorAtStart(selection, fullWordRange), completions, selectedIndex, !this.isCaretAtEndOfPrompt(), this._userEnteredText);
 
         if (selectedIndex === -1)
             return;
 
         var wordPrefixLength = originalWordPrefixRange.toString().length;
         this._commonPrefix = this._buildCommonPrefix(completions, wordPrefixLength);
 
         if (this.isCaretAtEndOfPrompt()) {
+            var completionText = completions[selectedIndex];
+            var prefixText = this._userEnteredRange.toString();
+            var suffixText = completionText.substring(wordPrefixLength);
             this._userEnteredRange.deleteContents();
             this._element.normalize();
             var finalSelectionRange = document.createRange();
-            var completionText = completions[selectedIndex];
-            var prefixText = completionText.substring(0, wordPrefixLength);
-            var suffixText = completionText.substring(wordPrefixLength);
 
             var prefixTextNode = document.createTextNode(prefixText);
             fullWordRange.insertNode(prefixTextNode);
 
             this.autoCompleteElement = document.createElementWithClass("span", "auto-complete-text");
             this.autoCompleteElement.textContent = suffixText;
 
             prefixTextNode.parentNode.insertBefore(this.autoCompleteElement, prefixTextNode.nextSibling);
 
             finalSelectionRange.setStart(prefixTextNode, wordPrefixLength);
@@ skipping 408 matching lines @@
 
             return;
         }
 
         WebInspector.TextPrompt.prototype.onKeyDown.apply(this, arguments);
     },
 
     __proto__: WebInspector.TextPrompt.prototype
 }