add-cache-buster-to-File.patch

Index: filesystem/File.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- framework/filesystem/File.php	(revision 8518)
+++ framework/filesystem/File.php	(revision 8519)
@@ -640,13 +640,29 @@
 	}
 
 	/**
+	 * Returns a string that can be added to the end of a URL
+	 * to prevent browser cache from loading old images and files
+	 *
+	 * @return string
+	 */
+	protected function getCacheBuster() {
+		$LastEdited = $this->LastEdited;
+		if (!$LastEdited) {
+			$Original = File::find($this->getFilename());
+			if (!$Original || !$Original->LastEdited) return '';
+			$LastEdited = $Original->LastEdited;
+		}
+		return '?'.preg_replace('/[^0-9]+/i','',$LastEdited);
+	}
+
+	/**
 	 * Gets the absolute URL accessible through the web.
 	 * 
 	 * @uses Director::absoluteBaseURL()
 	 * @return string
 	 */
 	public function getAbsoluteURL() {
-		return Director::absoluteBaseURL() . $this->getFilename();
+		return Director::absoluteBaseURL() . $this->getFilename() . $this->getCacheBuster();
 	}
 	
 	/**
@@ -656,7 +672,7 @@
 	 * @return string
 	 */
 	public function getURL() {
-		return Director::baseURL() . $this->getFilename();
+		return Director::baseURL() . $this->getFilename() . $this->getCacheBuster();
 	}
 
 	/**