Unhide message on failure

This is faster than fetching again

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

@@ -3006,7 +3006,8 @@ class Core {
                 }
 
                 if ((message.size != null && message.size < maxSize) ||
-                        (MessageClassifier.isEnabled(context)) && folder.auto_classify_source) {
+                        (MessageClassifier.isEnabled(context)) && folder.auto_classify_source)
+                    try {
                         String body = parts.getHtml(context);
                         File file = message.getFile(context);
                         Helper.writeText(file, body);
@@ -3017,8 +3018,6 @@ class Core {
                                 HtmlHelper.getPreview(body),
                                 parts.getWarnings(message.warning));
                         MessageClassifier.classify(message, folder, null, context);
-                    if (!message.ui_hide)
-                        db.message().setMessageUiHide(message.id, false);
 
                         if (stats != null && body != null)
                             stats.content += body.length();
@@ -3027,6 +3026,9 @@ class Core {
 
                         if (TextUtils.isEmpty(body) && parts.hasBody())
                             reportEmptyMessage(context, state, account, istore);
+                    } finally {
+                        if (!message.ui_hide)
+                            db.message().setMessageUiHide(message.id, false);
                     }
             }