Revert "Removed identity/self option"

This reverts commit 9195fc048d.

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

@@ -90,7 +90,7 @@ public class EntityIdentity {
     @NonNull
     public Boolean primary;
     @NonNull
-    public Boolean self = true; // obsolete
+    public Boolean self = true;
     @NonNull
     public Boolean sender_extra = false;
     public String sender_extra_regex;

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

@@ -214,6 +214,7 @@ public class EntityMessage implements Serializable {
             for (Address sender : senders)
                 for (TupleIdentityEx identity : identities)
                     if (identity.account == account &&
+                            identity.self &&
                             identity.similarAddress(sender))
                         return true;
 
@@ -234,6 +235,7 @@ public class EntityMessage implements Serializable {
             for (Address address : new ArrayList<>(addresses))
                 for (TupleIdentityEx identity : identities)
                     if (identity.account == account &&
+                            identity.self &&
                             identity.similarAddress(address))
                         addresses.remove(address);
 

app/src/main/res/layout/fragment_identity.xml

@@ -546,7 +546,6 @@
             android:layout_marginTop="12dp"
             android:checked="true"
             android:text="@string/title_self_identity"
-            android:visibility="gone"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/cbPrimary" />
 
@@ -826,7 +825,7 @@
                 tvUser,etUser,tvPassword,tilPassword,tvCaseSensitiveHint,btnCertificate,tvCertificate,btnOAuth,
                 tvRealm,etRealm,
                 cbUseIp,tvUseIpHint,tvEhlo,etEhlo,
-                cbSynchronize,cbPrimary,
+                cbSynchronize,cbPrimary,cbSelf,
                 cbSenderExtra,tvSenderExtra,etSenderExtra,tvSenderExtraHint,
                 tvReplyTo,etReplyTo,tvCc,etCc,tvCcHint,tvBcc,etBcc,tvBccHint,
                 cbUnicode,tvMaxSize,etMaxSize" />