Trailing whitespace in CHAR/VARCHAR break string matches - Revisited

This is a continuation of the following bug (which was fixed in 1.1.4):

https://jira.mariadb.org/browse/MCOL-1246

However, the bug does not address some edge case comparisons.

For instance, we've identified 2 cases where this is not working as expected:

1. This returns 0 results when the 'name' is "Majestic12 " (note trailing space):

SELECT name from `wpafb` where lower(name) like 'majestic12 ';

2. This one, I'm not as sure if it is a bug or not, but was reported nonetheless. This query finds all rows in the table whether they end in space of not:

SELECT CONCAT(name,'#') from `hangar18` where name like '% ';