Fix relative path resolution in View.

Relative paths in view file names where handled very poorly before when
subdirectories were involved. This was not very important in 2.x but is
more important for 3.x as we have Cells and relative paths should work
properly there.

Refs #3945

src/View/View.php

@@ -851,7 +851,7 @@ class View {
 				}
 				$name = trim($name, DS);
 			} elseif ($name[0] === '.') {
-				$name = substr($name, 3);
+				$name = $this->viewPath . DS . $subDir . $name;
 			} elseif (!$plugin || $this->viewPath !== $this->name) {
 				$name = $this->viewPath . DS . $subDir . $name;
 			}

tests/TestCase/View/ViewTest.php

@@ -492,7 +492,7 @@ class ViewTest extends TestCase {
 		$result = $View->getViewFileName('/Posts/index');
 		$this->assertPathEquals($expected, $result);
 
-		$expected = TEST_APP . 'TestApp' . DS . 'Template' . DS . 'Posts' . DS . 'index.ctp';
+		$expected = TEST_APP . 'TestApp' . DS . 'Template' . DS . 'Pages' . DS . '..' . DS . 'Posts' . DS . 'index.ctp';
 		$result = $View->getViewFileName('../Posts/index');
 		$this->assertPathEquals($expected, $result);
 
@@ -1127,7 +1127,7 @@ class ViewTest extends TestCase {
 		$result = $View->getViewFileName('../Element/test_element');
 		$this->assertRegExp('/Element(\/|\\\)test_element.ctp/', $result);
 
-		$expected = TEST_APP . 'TestApp' . DS . 'Template' . DS . 'Posts' . DS . 'index.ctp';
+		$expected = TEST_APP . 'TestApp' . DS . 'Template' . DS . 'Posts' . DS . '..' . DS . 'Posts' . DS . 'index.ctp';
 		$result = $View->getViewFileName('../Posts/index');
 		$this->assertPathEquals($expected, $result);
 	}