Fixed issue 404:

. Free up memory as we go in MessagingController.synchronizeMailboxSynchronous()
  . IMAP: We only do a partial fetch of the text body of large messages during background sync. This allow for faster syncs and avoid expensive parsing that lead to OutOfMemoryError

src/com/android/email/MessagingController.java

@@ -758,6 +758,7 @@ public class MessagingController implements Runnable {
                 if (Config.LOGV) {
                     Log.v(Email.LOG_TAG, "SYNC: Got " + remoteUidMap.size() + " messages for folder " + folder);
                 }
+                remoteMessageArray = null;
 
                 /*
                  * Get a list of the messages that are in the remote list but not on the
@@ -791,7 +792,7 @@ public class MessagingController implements Runnable {
 
             /*
              * Fetch the flags and envelope only of the new messages. This is intended to get us
-s             * critical data as fast as possible, and then we'll fill in the details.
+             * critical data as fast as possible, and then we'll fill in the details.
              */
             if (unsyncedMessages.size() > 0) {
 
@@ -926,6 +927,7 @@ s             * critical data as fast as possible, and then we'll fill in the de
                     }
                 }
             }
+            localMessages = null;
 
             /*
              * Now we download the actual content of messages.
@@ -947,6 +949,7 @@ s             * critical data as fast as possible, and then we'll fill in the de
                     + unsyncedMessages.size() + " un synced messages "
                     + " to fetch for folder " + folder);
             }
+            unsyncedMessages.clear();
 
 
             /*
@@ -997,6 +1000,7 @@ s             * critical data as fast as possible, and then we'll fill in the de
             if (Config.LOGV) {
                 Log.v(Email.LOG_TAG, "SYNC: Done fetching small messages for folder " + folder);
             }
+            smallMessages = null;
 
             /*
              * Now do the large messages that require more round trips.
@@ -1077,7 +1081,7 @@ s             * critical data as fast as possible, and then we'll fill in the de
 
                     // Set a flag indicating this message has been fully downloaded and can be
                     // viewed.
-                    localMessage.setFlag(Flag.X_DOWNLOADED_FULL, true);
+                    localMessage.setFlag(Flag.X_DOWNLOADED_PARTIAL, true);
                 }
                 if (isMessageSuppressed(account, folder, message) == false)
                 {
@@ -1089,10 +1093,11 @@ s             * critical data as fast as possible, and then we'll fill in the de
                             localFolder.getMessage(message.getUid()));
                     }
                 }
-            }
+            }//for large messsages
             if (Config.LOGV) {
                 Log.v(Email.LOG_TAG, "SYNC: Done fetching large messages for folder " + folder);
             }
+            largeMessages = null;
 
 
             /*

src/com/android/email/mail/Store.java

@@ -23,7 +23,8 @@ public abstract class Store {
      * A global suggestion to Store implementors on how much of the body
      * should be returned on FetchProfile.Item.BODY_SANE requests.
      */
-    public static final int FETCH_BODY_SANE_SUGGESTED_SIZE = (50 * 1024);
+    //Matching MessagingController.MAX_SMALL_MESSAGE_SIZE
+    public static final int FETCH_BODY_SANE_SUGGESTED_SIZE = (5 * 1024);
 
     protected static final int SOCKET_CONNECT_TIMEOUT = 10000;
     protected static final int SOCKET_READ_TIMEOUT = 60000;

src/com/android/email/mail/store/ImapStore.java

@@ -738,7 +738,12 @@ public class ImapStore extends Store {
                 if (o instanceof Part) {
                     Part part = (Part) o;
                     String partId = part.getHeader(MimeHeader.HEADER_ANDROID_ATTACHMENT_STORE_DATA)[0];
-                    fetchFields.add("BODY.PEEK[" + partId + "]");
+                    if ("TEXT".equals(partId)) {
+                        fetchFields.add(String.format("BODY.PEEK[TEXT]<0.%d>", FETCH_BODY_SANE_SUGGESTED_SIZE));
+                    }
+                    else {
+                        fetchFields.add("BODY.PEEK[" + partId + "]");
+                    }
                 }
             }
 
@@ -1457,6 +1462,7 @@ public class ImapStore extends Store {
             open();
             String tag = Integer.toString(mNextCommandTag++);
             String commandToSend = tag + " " + command;
+            Log.v(Email.LOG_TAG, commandToSend);
             mOut.write(commandToSend.getBytes());
             mOut.write('\r');
             mOut.write('\n');