114960 r=bhuvan sr=mscott. Select the search string when the focus is on the search input field.

mailnews/base/resources/content/mailWindowOverlay.xul

@@ -1487,7 +1487,7 @@ Rights Reserved.
 
 <hbox id="searchBox" persist="collapsed" align="center">
   <label id="searchCriteria" value="&SearchSubjectOrSender.label;"/>
-  <textbox id="searchInput" flex="1" oninput="onSearchInput(event);"/>
+  <textbox id="searchInput" flex="1" onfocus="searchInputFocus();" oninput="onSearchInput(event);"/>
   <button id="clearButton" label="&clearButton.label;" disabled="true" tooltiptext="&clearButton.tooltip;" oncommand="onClearSearch();" accesskey="&clearButton.accesskey;"/>
   <button id="advancedButton" label="&advancedButton.label;" tooltiptext="&advancedButton.tooltip;" oncommand="onAdvancedSearch();"/>
 </hbox>

mailnews/base/resources/content/searchBar.js

@@ -80,7 +80,6 @@ function getDocumentElements()
 {
   gSearchBundle = document.getElementById("bundle_search");  
   gStatusBar = document.getElementById('statusbar-icon');
-  gSearchInput = document.getElementById('searchInput');
   gSearchCriteria =document.getElementById('searchCriteria');
   gClearButton = document.getElementById('clearButton');
 }
@@ -234,3 +233,10 @@ function disableQuickSearchClearButton()
  if (gClearButton)
    gClearButton.setAttribute("disabled", true); //going out of search disable clear button
 }
+
+function searchInputFocus()
+{
+  var searchInput = GetSearchInput();
+  if (searchInput.value)
+    searchInput.select();
+}