updated for version 7.3.1303
Problem:    Undo is synced whenever CTRL-R = is called, breaking some plugins.
Solution:   Only break undo when calling setline() or append().
Added tag v7-3-1303 for changeset 6e611380b4cf
updated for version 7.3.1304
Problem:    Test 89 still fails on MS-Windows.
Solution:   Set 'shellslash'. (Taro Muraoka)
Added tag v7-3-1304 for changeset 46d6318d5b96