MINOR: Include the title attribute on tree and readonly fields.

forms/TreeMultiselectField.php

@@ -114,6 +114,7 @@ function Field($properties = array()) {
 				'class' => 'TreeDropdownField multiple' . ($this->extraClass() ? " {$this->extraClass()}" : '') . ($this->showSearch ? " searchable" : ''),
 				'data-url-tree' => $this->form ? $this->Link('tree') : "",
 				'data-title' => $title,
+				'title' => $this->getDescription()
 			),
 			$this->createTag (
 				'input',

templates/forms/FormField.ss

@@ -1,5 +1,9 @@
 <% if isReadonly %>
-	<span id="$ID"<% if extraClass %> class="$extraClass"<% end_if %>>$Value</span>
+	<span id="$ID"
+	      <% if extraClass %>class="$extraClass"<% end_if %>
+	      <% if $Description %>title="$Description"<% end_if %>>
+		$Value
+	</span>
 <% else %>
 	<input $AttributesHTML>
 <% end_if %>

templates/forms/TreeDropdownField.ss

@@ -1,3 +1,8 @@
-<div id="TreeDropdownField_$ID" class="TreeDropdownField single<% if extraClass %> $extraClass<% end_if %><% if ShowSearch %> searchable<% end_if %>" data-url-tree="$Link(tree)" data-title="$Title"<% if Metadata %> data-metadata="$Metadata"<% end_if %>>
+<div id="TreeDropdownField_$ID"
+     class="TreeDropdownField single<% if extraClass %> $extraClass<% end_if %><% if ShowSearch %> searchable<% end_if %>"
+     data-url-tree="$Link(tree)"
+     data-title="$Title"
+     <% if Description %>title="$Description"<% end_if %>
+     <% if Metadata %>data-metadata="$Metadata"<% end_if %>>
 	<input id="$ID" type="hidden" name="$Name" value="$Value" />
 </div>