decoder: Pass on transformations_applied info

This prevents HEIF images from getting transformations applied
again that already has been applied by the decoder.

Closes #251

NEWS

@@ -7,6 +7,7 @@
 - Fix print dialog needs second confirmation inside Flatpaks
 - Fix SVGs sometimes not re-rendering for zoom level
 - Fix animated image formats with variable frame length using only one length
+- Fix rotation getting applied twice to HEIF images
 
 45.0
 =======

data/org.gnome.Loupe.metainfo.xml.in.in

@@ -72,6 +72,7 @@
           <li>Sandboxed image interpretation is now enabled by default.</li>
           <li>Printing now prints on the selected printer.</li>
           <li>Image formats like GIFs with different frame lengs are now animated correctly.</li>
+          <li>Images of the formats HEIC and AVIF are now rotated correctly.</li>
         </ul>
       </description>
     </release>

src/decoder/formats/glycin_proxy.rs

@@ -62,9 +62,9 @@ impl Glycin {
             let image = image_request.request().await?;
 
             if let Some(exif_raw) = image.info().exif.clone().into() {
-                updater.send(DecoderUpdate::Metadata(ImageMetadata::from_exif_bytes(
-                    exif_raw,
-                )));
+                let mut metadata = ImageMetadata::from_exif_bytes(exif_raw);
+                metadata.heif_transform = image.info().transformations_applied;
+                updater.send(DecoderUpdate::Metadata(metadata));
             }
 
             let dimensions = (image.info().width, image.info().height);