fix #2855: delete big comments and truncate new inserted comments

WordPressUtils/src/main/java/org/wordpress/android/util/SqlUtils.java

@@ -7,6 +7,8 @@
 import android.database.sqlite.SQLiteException;
 import android.database.sqlite.SQLiteStatement;
 
+import org.wordpress.android.util.AppLog.T;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -118,4 +120,21 @@ public static boolean dropAllTables(SQLiteDatabase db) throws SQLiteException {
             db.endTransaction();
         }
     }
+
+    /*
+     * Android's CursorWindow has a max size of 2MB per row which can be exceeded
+     * with a very large text column, causing an IllegalStateException when the
+     * row is read - prevent this by limiting the amount of text that's stored in
+     * the text column.
+     * https://github.com/android/platform_frameworks_base/blob/b77bc869241644a662f7e615b0b00ecb5aee373d/core/res/res/values/config.xml#L1268
+     * https://github.com/android/platform_frameworks_base/blob/3bdbf644d61f46b531838558fabbd5b990fc4913/core/java/android/database/CursorWindow.java#L103
+     */
+    private static final int MAX_TEXT_LEN = 1024 * 1024;
+    public static String maxSQLiteText(final String text) {
+        if (text.length() <= MAX_TEXT_LEN) {
+            return text;
+        }
+        AppLog.w(T.UTILS, "sqlite > max text exceeded, storing truncated text");
+        return text.substring(0, MAX_TEXT_LEN);
+    }
 }