Added cross account copy

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

@@ -998,6 +998,7 @@ class Core {
         // Get arguments
         long target = jargs.optLong(0, folder.id);
         boolean autoread = jargs.optBoolean(1, false);
+        boolean copy = jargs.optBoolean(2, false); // Cross account
 
         if (target != folder.id)
             throw new IllegalArgumentException("Invalid folder");
@@ -1161,7 +1162,8 @@ class Core {
                         EntityOperation.queue(context, message, EntityOperation.SEEN, true);
 
                     // Delete source
-                    EntityOperation.queue(context, message, EntityOperation.DELETE);
+                    if (!copy)
+                        EntityOperation.queue(context, message, EntityOperation.DELETE);
                 }
 
                 db.setTransactionSuccessful();
@@ -1704,7 +1706,7 @@ class Core {
         }
 
         if (jargs.length() > 0) {
-            // Cross account move
+            // Cross account move/copy
             long tid = jargs.getLong(0);
             EntityFolder target = db.folder().getFolder(tid);
             if (target == null)

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

@@ -355,6 +355,26 @@ public class EntityOperation {
                 }
 
                 return;
+            } else if (COPY.equals(name)) {
+                // Parameters in:
+                // 0: target folder
+                // 1: mark seen
+
+                EntityFolder source = db.folder().getFolder(message.folder);
+                EntityFolder target = db.folder().getFolder(jargs.getLong(0));
+                if (source == null || target == null)
+                    return;
+
+                // Cross account copy
+                if (!source.account.equals(target.account)) {
+                    jargs.put(2, true); // copy
+                    if (message.raw != null && message.raw)
+                        queue(context, target.account, target.id, message.id, ADD, jargs);
+                    else
+                        queue(context, source.account, source.id, message.id, RAW, jargs);
+                    return;
+                }
+
             } else if (DELETE.equals(name)) {
                 SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
                 boolean perform_expunge = prefs.getBoolean("perform_expunge", true);

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

@@ -67,7 +67,7 @@ public class FragmentDialogFolder extends FragmentDialogBase {
         final String title = aargs.getString("title");
         final long account = aargs.getLong("account");
         final long[] disabled = aargs.getLongArray("disabled");
-        final boolean cancopy = aargs.getBoolean("cancopy") && false;
+        final boolean cancopy = aargs.getBoolean("cancopy");
 
         final Context context = getContext();
         final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);