Fix setting default quality in WP_Image_Editor.

props markoheijnen.
fixes #29856 for trunk.

git-svn-id: https://develop.svn.wordpress.org/trunk@29834 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-image-editor-gd.php

@@ -114,7 +114,7 @@ class WP_Image_Editor_GD extends WP_Image_Editor {
 		$this->update_size( $size[0], $size[1] );
 		$this->mime_type = $size['mime'];
 
-		return true;
+		return $this->set_quality();
 	}
 
 	/**

src/wp-includes/class-wp-image-editor-imagick.php

@@ -140,10 +140,11 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
 		}
 
 		$updated_size = $this->update_size();
-		if ( is_wp_error( $updated_size ) )
-				return $updated_size;
+		if ( is_wp_error( $updated_size ) ) {
+			return $updated_size;
+		}
 
-		return true;
+		return $this->set_quality();
 	}
 
 	/**

src/wp-includes/class-wp-image-editor.php

@@ -236,10 +236,10 @@ abstract class WP_Image_Editor {
 				 * @param string $context Context of the filter.
 				 */
 				$quality = apply_filters( 'jpeg_quality', $quality, 'image_resize' );
+			}
 
-				if ( ! $this->set_quality( $quality ) ) {
-					$this->quality = $this->default_quality;
-				}
+			if ( ! $this->set_quality( $quality ) ) {
+				$this->quality = $this->default_quality;
 			}
 		}
 
@@ -256,8 +256,12 @@ abstract class WP_Image_Editor {
 	 * @return boolean|WP_Error True if set successfully; WP_Error on failure.
 	 */
 	public function set_quality( $quality = null ) {
+		if ( null === $quality ) {
+			$quality = $this->default_quality;
+		}
+
 		// Allow 0, but squash to 1 due to identical images in GD, and for backwards compatibility.
-		if ( $quality == 0 ) {
+		if ( 0 === $quality ) {
 			$quality = 1;
 		}