Allow marking contacts as untrusted

FAQ.md

@@ -191,6 +191,7 @@ FairEmail follows all the best practices for an email client as decribed in [thi
 * [(113) How does biometric authentication work?](#user-content-faq113)
 * [(114) Can you add an import for the settings of other email apps?](#user-content-faq114)
 * [(115) Can you add email address chips?](#user-content-faq114)
+* [(116) How can I show images in messages from trusted senders by default?](#user-content-faq116)
 
 [I have another question.](#support)
 
@@ -1942,7 +1943,15 @@ Reverted [commit](https://github.com/M66B/FairEmail/commit/2c80c25b8aa75af2287f4
 
 <br />
 
+<a name="faq116"></a>
+**(116) How can I show images in messages from trusted senders by default?**
 
+You can show images in messages from trusted senders by default by enabled the display setting *Automatically show images for known contacts*.
+
+People in the Android contacts list are considered to be known and trusted,
+unless the contact relation is set to '*Untrusted*' (case insensitive; the relation type, for example parent, child, friend, etc does not matter).
+
+<br />
 
 ## Support
 

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

@@ -258,6 +258,19 @@ public class ContactInfo {
                     String lookupKey = cursor.getString(1);
                     String email = cursor.getString(2);
 
+                    Cursor relation = resolver.query(
+                            ContactsContract.Data.CONTENT_URI,
+                            new String[]{ContactsContract.CommonDataKinds.Relation.NAME},
+                            ContactsContract.Data.MIMETYPE + " = '" + ContactsContract.CommonDataKinds.Relation.CONTENT_ITEM_TYPE + "'" +
+                                    " AND " + ContactsContract.CommonDataKinds.Relation.NAME + " = 'UNTRUSTED' COLLATE NOCASE" +
+                                    " AND " + ContactsContract.CommonDataKinds.Relation.CONTACT_ID + " = ?",
+                            new String[]{Long.toString(contactId)},
+                            null);
+                    if (relation != null && relation.moveToNext()) {
+                        Log.i("Contact email=" + email + " relation=" + relation.getString(0));
+                        continue;
+                    }
+
                     Uri uri = ContactsContract.Contacts.getLookupUri(contactId, lookupKey);
                     all.put(email, uri);
                 }