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

Source/devtools/front_end/ui/TextPrompt.js

Index: Source/devtools/front_end/ui/TextPrompt.js
diff --git a/Source/devtools/front_end/ui/TextPrompt.js b/Source/devtools/front_end/ui/TextPrompt.js
index 909135022016ab3b25485686c0f8caa72dbb4c29..f0281ede9ac5c1270d8c38bd9893723486b58c68 100644
--- a/Source/devtools/front_end/ui/TextPrompt.js
+++ b/Source/devtools/front_end/ui/TextPrompt.js
@@ -472,12 +472,12 @@ WebInspector.TextPrompt.prototype = {
         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);