removed DNG metadata editing

CHANGELOG.md

@@ -15,6 +15,10 @@ All notable changes to this project will be documented in this file.
 
 - Viewer: quick action defaults
 
+### Removed
+
+- metadata editing support for DNG
+
 ### Fixed
 
 - app launch despite faulty storage volumes on Android 11+

lib/model/entry.dart

@@ -258,9 +258,10 @@ class AvesEntry {
   bool get canRotateAndFlip => canEdit && canEditExif;
 
   // as of androidx.exifinterface:exifinterface:1.3.3
+  // `exifinterface` declares support for DNG, but `exifinterface` strips non-standard Exif tags when saving attributes,
+  // and DNG requires DNG-specific tags saved along standard Exif. So `exifinterface` actually breaks DNG files.
   bool get canEditExif {
     switch (mimeType.toLowerCase()) {
-      case MimeTypes.dng:
       case MimeTypes.jpeg:
       case MimeTypes.png:
       case MimeTypes.webp: