Automatically #find_and_preserve filters that use #render.

lib/haml/filters.rb

@@ -68,7 +68,7 @@ module Haml
             return
           end
 
-          rendered = filter.render(text)
+          rendered = Haml::Helpers::find_and_preserve(filter.render(text), precompiler.options[:preserve])
 
           if !options[:ugly]
             push_text(rendered.rstrip.gsub("\n", "\n#{'  ' * @output_tabs}"))

test/haml/results/filters.xhtml

@@ -11,9 +11,7 @@ TESTING HAHAHAHA!
 <h1>Foo</h1>
 
 
-	<pre><code>This is preformatted!
-Look at that!
-Wowie-zowie!</code></pre>
+	<pre><code>This is preformatted!&#x000A;Look at that!&#x000A;Wowie-zowie!</code></pre>
 
 
 	<p><strong>boldilicious!</strong></p>
@@ -69,6 +67,12 @@ This
 
 </ul>
 <div class='res'>178</div>
+<p>
+  <p>I like preserved text:</p>
+  
+  
+  	<pre><code>Foo&#x000A;  Bar!&#x000A;Baz</code></pre>
+</p>
 <ul>
 <li>Foo</li>
 <li>Bar</li>

test/haml/templates/filters.haml

@@ -68,6 +68,14 @@
 
 .res= res
 
+%p
+  :textile
+    I like preserved text:
+
+      Foo
+        Bar!
+      Baz
+
 :markdown
   *  Foo
   *  Bar