Removed special folder case

Some providers make all folders subfolder of the inbox

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

@@ -93,7 +93,6 @@ public class EntityFolder implements Serializable {
     public String error;
 
     static final String INBOX = "Inbox";
-    static final String INBOX_SUB = "Inbox_sub";
     static final String OUTBOX = "Outbox";
     static final String ARCHIVE = "All";
     static final String DRAFTS = "Drafts";
@@ -127,7 +126,6 @@ public class EntityFolder implements Serializable {
 
     static final List<String> FOLDER_SORT_ORDER = Arrays.asList(
             INBOX,
-            INBOX_SUB,
             OUTBOX,
             DRAFTS,
             SENT,

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

@@ -1949,10 +1949,6 @@ public class ServiceSynchronize extends LifecycleService {
                     }
                 }
 
-                // Special case
-                if (type == null && fullName.startsWith("INBOX" + separator))
-                    type = EntityFolder.INBOX_SUB;
-
                 if (selectable) {
                     int level = EntityFolder.getLevel(separator, fullName);
                     EntityFolder folder = db.folder().getFolderByName(account.id, fullName);
@@ -1971,8 +1967,9 @@ public class ServiceSynchronize extends LifecycleService {
                     } else {
                         Log.i(Helper.TAG, folder.name + " exists");
                         db.folder().setFolderLevel(folder.id, level);
-                        if (EntityFolder.USER.equals(folder.type) &&
+                        if ("Inbox_sub".equals(folder.type))
-                                (EntityFolder.INBOX_SUB.equals(type) || EntityFolder.SYSTEM.equals(type)))
+                            db.folder().setFolderType(folder.id, EntityFolder.USER);
+                        else if (EntityFolder.USER.equals(folder.type) && EntityFolder.SYSTEM.equals(type))
                             db.folder().setFolderType(folder.id, type);
                     }
                 }

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

@@ -221,7 +221,6 @@
 
     <string name="title_folder_unified">Unified inbox</string>
     <string name="title_folder_inbox">Inbox</string>
-    <string name="title_folder_inbox_sub">Inbox child</string>
     <string name="title_folder_outbox">Outbox</string>
     <string name="title_folder_all">Archive</string>
     <string name="title_folder_drafts">Drafts</string>