Added chunk size debug option

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

@@ -67,7 +67,6 @@ import com.sun.mail.imap.IMAPStore;
 import com.sun.mail.imap.protocol.FLAGS;
 import com.sun.mail.imap.protocol.FetchResponse;
 import com.sun.mail.imap.protocol.IMAPProtocol;
-import com.sun.mail.imap.protocol.Namespaces;
 import com.sun.mail.imap.protocol.UID;
 import com.sun.mail.pop3.POP3Folder;
 import com.sun.mail.pop3.POP3Message;
@@ -137,10 +136,11 @@ import javax.mail.search.SentDateTerm;
 import me.leolin.shortcutbadger.ShortcutBadger;
 
 class Core {
+    static final int DEFAULT_SYNC_CHUNCK_SIZE = 100;
+
     private static final int MAX_NOTIFICATION_DISPLAY = 10; // per group
     private static final int MAX_NOTIFICATION_COUNT = 100; // per group
     private static final long SCREEN_ON_DURATION = 3000L; // milliseconds
-    private static final int SYNC_CHUNCK_SIZE = 100;
     private static final int SYNC_BATCH_SIZE = 20;
     private static final int DOWNLOAD_BATCH_SIZE = 20;
     private static final int SYNC_YIELD_COUNT = 100;
@@ -3120,7 +3120,8 @@ class Core {
                                     ranges.add(new Pair<>(first, last < 0 ? first : last));
 
                                 // https://datatracker.ietf.org/doc/html/rfc2683#section-3.2.1.5
-                                List<List<Pair<Long, Long>>> chunks = Helper.chunkList(ranges, SYNC_CHUNCK_SIZE);
+                                int chunk_size = prefs.getInt("chunk_size", DEFAULT_SYNC_CHUNCK_SIZE);
+                                List<List<Pair<Long, Long>>> chunks = Helper.chunkList(ranges, chunk_size);
 
                                 Log.i(folder.name + " executing uid fetch count=" + uids.size() +
                                         " ranges=" + ranges.size() + " chunks=" + chunks.size());

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

@@ -135,6 +135,8 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
     private SwitchCompat swCheckpoints;
     private TextView tvSqliteCache;
     private SeekBar sbSqliteCache;
+    private TextView tvChunkSize;
+    private SeekBar sbChunkSize;
     private ImageButton ibSqliteCache;
     private SwitchCompat swModSeq;
     private SwitchCompat swExpunge;
@@ -174,7 +176,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
             "experiments", "crash_reports", "cleanup_attachments",
             "protocol", "debug", "log_level",
             "query_threads", "wal", "checkpoints", "sqlite_cache",
-            "use_modseq", "perform_expunge",
+            "chunk_size", "use_modseq", "perform_expunge",
             "auth_plain", "auth_login", "auth_ntlm", "auth_sasl",
             "exact_alarms", "dup_msgids", "test_iab"
     };
@@ -263,6 +265,8 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
         tvSqliteCache = view.findViewById(R.id.tvSqliteCache);
         sbSqliteCache = view.findViewById(R.id.sbSqliteCache);
         ibSqliteCache = view.findViewById(R.id.ibSqliteCache);
+        tvChunkSize = view.findViewById(R.id.tvChunkSize);
+        sbChunkSize = view.findViewById(R.id.sbChunkSize);
         swModSeq = view.findViewById(R.id.swModSeq);
         swExpunge = view.findViewById(R.id.swExpunge);
         swAuthPlain = view.findViewById(R.id.swAuthPlain);
@@ -775,6 +779,27 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
             }
         });
 
+        sbChunkSize.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
+            @Override
+            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+                progress = progress / 10;
+                if (progress < 1)
+                    progress = 1;
+                progress = progress * 10;
+                prefs.edit().putInt("chunk_size", progress).apply();
+            }
+
+            @Override
+            public void onStartTrackingTouch(SeekBar seekBar) {
+                // Do nothing
+            }
+
+            @Override
+            public void onStopTrackingTouch(SeekBar seekBar) {
+                // Do nothing
+            }
+        });
+
         swProtocol.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
@@ -1287,6 +1312,10 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
                 Helper.humanReadableByteCount(cache_size * 1024L)));
         sbSqliteCache.setProgress(sqlite_cache);
 
+        int chunk_size = prefs.getInt("chunk_size", Core.DEFAULT_SYNC_CHUNCK_SIZE);
+        tvChunkSize.setText(getString(R.string.title_advanced_chunk_size, chunk_size));
+        sbChunkSize.setProgress(chunk_size);
+
         swModSeq.setChecked(prefs.getBoolean("use_modseq", true));
         swExpunge.setChecked(prefs.getBoolean("perform_expunge", true));
         swAuthPlain.setChecked(prefs.getBoolean("auth_plain", true));

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

@@ -744,6 +744,29 @@
                     app:layout_constraintStart_toStartOf="parent"
                     app:layout_constraintTop_toBottomOf="@id/ibSqliteCache" />
 
+                <eu.faircode.email.FixedTextView
+                    android:id="@+id/tvChunkSize"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="12dp"
+                    android:layout_marginEnd="48dp"
+                    android:text="@string/title_advanced_chunk_size"
+                    android:textAppearance="@style/TextAppearance.AppCompat.Small"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toBottomOf="@id/tvSqliteCacheHint" />
+
+                <SeekBar
+                    android:id="@+id/sbChunkSize"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:max="1000"
+                    android:min="0"
+                    android:progress="100"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toBottomOf="@id/tvChunkSize" />
+
                 <androidx.appcompat.widget.SwitchCompat
                     android:id="@+id/swModSeq"
                     android:layout_width="0dp"
@@ -753,7 +776,7 @@
                     android:text="@string/title_advanced_modseq"
                     app:layout_constraintEnd_toEndOf="parent"
                     app:layout_constraintStart_toStartOf="parent"
-                    app:layout_constraintTop_toBottomOf="@id/tvSqliteCacheHint"
+                    app:layout_constraintTop_toBottomOf="@id/sbChunkSize"
                     app:switchPadding="12dp" />
 
                 <androidx.appcompat.widget.SwitchCompat

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

@@ -658,6 +658,7 @@
     <string name="title_advanced_wal" translatable="false">WAL</string>
     <string name="title_advanced_checkpoints" translatable="false">Checkpoints</string>
     <string name="title_advanced_sqlite_cache" translatable="false">Sqlite cache: %1$s %% - %2$s</string>
+    <string name="title_advanced_chunk_size" translatable="false">Chunk size: %1$d</string>
     <string name="title_advanced_modseq" translatable="false">MODSEQ</string>
     <string name="title_advanced_expunge" translatable="false">EXPUNGE</string>
     <string name="title_advanced_auth_plain" translatable="false">PLAIN</string>