Issue Summary

Old editor hangs completely OR it takes a lot of time to load if there are 10+ columns and unclose them using markdown syntax.

Steps to Reproduce

1. Create page with Old Editor where there will be 10+ columns and have the last column not "closed"
   ie.

   | test | test| test| test| test| test| test| test| test| test| test| test| test

1. Have your cursor at the end of this line and hit "Enter". This should create a table with columns.

Expected Results

A table with 10+ columns is created, last "test" word is not a part of the table.

Actual Results

Page freezes on Chrome and Firefox, while the new line delays for brief seconds on Safari

Workaround

Closing the table by adding "|" at the end, will make the page work correctly