Experiment: load alternative message part

app/src/main/java/eu/faircode/email/AdapterMessage.java

@@ -5109,6 +5109,10 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     .setVisible(message.accountProtocol == EntityAccount.TYPE_IMAP ||
                             EntityFolder.INBOX.equals(message.folderType));
 
+            popupMenu.getMenu().findItem(R.id.menu_alternative)
+                    .setEnabled(message.uid != null && message.plain_only != null)
+                    .setVisible(BuildConfig.DEBUG);
+
             popupMenu.insertIcons(context);
 
             MenuCompat.setGroupDividerEnabled(popupMenu.getMenu(), true);
@@ -5203,6 +5207,9 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     } else if (itemId == R.id.menu_resync) {
                         onMenuResync(message);
                         return true;
+                    } else if (itemId == R.id.menu_alternative) {
+                        onMenuAlt(message);
+                        return true;
                     } else if (itemId == R.id.menu_log) {
                         onMenuLog(message);
                         return true;
@@ -5595,6 +5602,49 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             }.execute(context, owner, args, "message:resync");
         }
 
+        private void onMenuAlt(TupleMessageEx message) {
+            properties.setSize(message.id, null);
+            properties.setHeight(message.id, null);
+            properties.setPosition(message.id, null);
+
+            Bundle args = new Bundle();
+            args.putLong("id", message.id);
+
+            new SimpleTask<Void>() {
+                @Override
+                protected Void onExecute(Context context, Bundle args) {
+                    long id = args.getLong("id");
+
+                    DB db = DB.getInstance(context);
+                    try {
+                        db.beginTransaction();
+
+                        EntityMessage message = db.message().getMessage(id);
+                        if (message == null)
+                            return null;
+
+                        EntityOperation.queue(context, message, EntityOperation.BODY, !message.plain_only);
+
+                        db.setTransactionSuccessful();
+                    } finally {
+                        db.endTransaction();
+                    }
+
+                    return null;
+                }
+
+                @Override
+                protected void onExecuted(Bundle args, Void data) {
+                    ToastEx.makeText(context, R.string.title_fetching_again, Toast.LENGTH_LONG).show();
+                }
+
+                @Override
+                protected void onException(Bundle args, Throwable ex) {
+                    Log.unexpectedError(parentFragment.getParentFragmentManager(), ex);
+                }
+            }.execute(context, owner, args, "message:resync");
+        }
+
         private void onMenuNotes(TupleMessageEx message) {
             Bundle args = new Bundle();
             args.putLong("id", message.id);

app/src/main/java/eu/faircode/email/Core.java

@@ -1932,10 +1932,13 @@ class Core {
     }
 
     private static void onBody(Context context, JSONArray jargs, EntityFolder folder, EntityMessage message, IMAPFolder ifolder) throws MessagingException, IOException {
+        boolean plain_text = jargs.optBoolean(0);
+
         // Download message body
         DB db = DB.getInstance(context);
 
-        if (message.content)
+        if (message.content &&
+                Objects.equals(message.plain_only, plain_text))
             return;
 
         // Get message
@@ -1945,7 +1948,7 @@ class Core {
 
         MessageHelper helper = new MessageHelper((MimeMessage) imessage, context);
         MessageHelper.MessageParts parts = helper.getMessageParts();
-        String body = parts.getHtml(context);
+        String body = parts.getHtml(context, plain_text);
         File file = message.getFile(context);
         Helper.writeText(file, body);
         String text = HtmlHelper.getFullText(body);
@@ -1954,7 +1957,7 @@ class Core {
         db.message().setMessageContent(message.id,
                 true,
                 message.language,
-                parts.isPlainOnly(),
+                plain_text || parts.isPlainOnly(),
                 message.preview,
                 parts.getWarnings(message.warning));
         MessageClassifier.classify(message, folder, null, context);

app/src/main/java/eu/faircode/email/MessageHelper.java

@@ -2842,6 +2842,10 @@ public class MessageHelper {
         }
 
         String getHtml(Context context) throws MessagingException, IOException {
+            return getHtml(context, false);
+        }
+
+        String getHtml(Context context, boolean plain_text) throws MessagingException, IOException {
             if (text.size() == 0) {
                 Log.i("No body part");
                 return null;
@@ -2856,8 +2860,13 @@ public class MessageHelper {
                 parts.addAll(text);
             else
                 for (PartHolder h : text)
-                    if (h.isHtml())
-                        parts.add(h);
+                    if (plain_text) {
+                        if (h.isPlainText())
+                            parts.add(h);
+                    } else {
+                        if (h.isHtml())
+                            parts.add(h);
+                    }
 
             parts.addAll(extra);
 

app/src/main/res/drawable/twotone_sync_alt_24.xml

@@ -0,0 +1,13 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M18,12l4,-4l-4,-4l0,3l-15,0l0,2l15,0z"/>
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M6,12l-4,4l4,4l0,-3l15,0l0,-2l-15,0z"/>
+</vector>

app/src/main/res/menu/popup_message_more.xml

@@ -155,6 +155,11 @@
             android:icon="@drawable/twotone_sync_24"
             android:title="@string/title_resync" />
 
+        <item
+            android:id="@+id/menu_alternative"
+            android:icon="@drawable/twotone_sync_alt_24"
+            android:title="@string/title_alternative" />
+
         <item
             android:id="@+id/menu_log"
             android:icon="@drawable/twotone_dns_24"

app/src/main/res/values/strings.xml

@@ -1369,6 +1369,7 @@
     <string name="title_encrypt">Encrypt</string>
     <string name="title_decrypt">Decrypt</string>
     <string name="title_resync">Resync</string>
+    <string name="title_alternative" translatable="false">Alternative</string>
     <string name="title_no_openpgp">OpenKeychain not found</string>
     <string name="title_user_interaction">Transferring to OpenKeychain</string>
     <string name="title_signed_data">Verify the signature to show the message text</string>