Media: Reset Exif orientation after rotate in WP_Image_Editor_Imagick.

Due to inconsistencies in the way browsers handle Exif orientation data,
if a user manually rotates an image within WordPress, set the Exif orientation to
the default (1) so that the image displays with the same rotation/flip in every browser.

Props sanchothefat, triplejumper12, joemcgill, azaozz, markoheijnen, mikeschroder.
See #14459.
Fixes #37140.

git-svn-id: https://develop.svn.wordpress.org/trunk@40123 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -549,6 +549,9 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
 		try {
 			$this->image->rotateImage( new ImagickPixel('none'), 360-$angle );
 
+			// Normalise Exif orientation data so that display is consistent across devices.
+			$this->image->setImageOrientation( Imagick::ORIENTATION_TOPLEFT );
+
 			// Since this changes the dimensions of the image, update the size.
 			$result = $this->update_size();
 			if ( is_wp_error( $result ) )