Set trash and junk to polling

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

@@ -214,6 +214,14 @@ public class EntityFolder extends EntityOrder implements Serializable {
             TRASH,
             JUNK
     ));
+    private static final List<Boolean> SYSTEM_FOLDER_POLL = Collections.unmodifiableList(Arrays.asList(
+            false, // inbox
+            false, // drafts
+            false, // sent
+            false, // archive
+            true, // trash
+            true // junk
+    )); // MUST match SYSTEM_FOLDER_SYNC
     private static final List<Boolean> SYSTEM_FOLDER_DOWNLOAD = Collections.unmodifiableList(Arrays.asList(
             true, // inbox
             true, // drafts
@@ -235,6 +243,7 @@ public class EntityFolder extends EntityOrder implements Serializable {
     void setProperties() {
         int sync = EntityFolder.SYSTEM_FOLDER_SYNC.indexOf(type);
         this.synchronize = (sync >= 0);
+        this.poll = (sync < 0 || EntityFolder.SYSTEM_FOLDER_POLL.get(sync));
         this.download = (sync < 0 || EntityFolder.SYSTEM_FOLDER_DOWNLOAD.get(sync));
 
         this.sync_days = EntityFolder.DEFAULT_SYNC;
@@ -251,6 +260,11 @@ public class EntityFolder extends EntityOrder implements Serializable {
         }
     }
 
+    static boolean shouldPoll(String type) {
+        int sync = EntityFolder.SYSTEM_FOLDER_SYNC.indexOf(type);
+        return (sync < 0 || EntityFolder.SYSTEM_FOLDER_POLL.get(sync));
+    }
+
     static EntityFolder getOutbox() {
         EntityFolder outbox = new EntityFolder();
         outbox.name = "OUTBOX";

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

@@ -1164,28 +1164,28 @@ public class FragmentAccount extends FragmentBase {
 
                     if (drafts != null) {
                         drafts.type = EntityFolder.DRAFTS;
-                        drafts.poll = false;
+                        drafts.poll = EntityFolder.shouldPoll(drafts.type);
                         folders.add(drafts);
                     }
 
                     if (sent != null) {
                         sent.type = EntityFolder.SENT;
-                        sent.poll = false;
+                        sent.poll = EntityFolder.shouldPoll(sent.type);
                         folders.add(sent);
                     }
                     if (archive != null) {
                         archive.type = EntityFolder.ARCHIVE;
-                        archive.poll = false;
+                        archive.poll = EntityFolder.shouldPoll(archive.type);
                         folders.add(archive);
                     }
                     if (trash != null) {
                         trash.type = EntityFolder.TRASH;
-                        trash.poll = false;
+                        trash.poll = EntityFolder.shouldPoll(trash.type);
                         folders.add(trash);
                     }
                     if (junk != null) {
                         junk.type = EntityFolder.JUNK;
-                        junk.poll = false;
+                        junk.poll = EntityFolder.shouldPoll(junk.type);
                         folders.add(junk);
                     }