qlafilter escapes newline with two quotes and a space

The default value for the qlafilter newline replacement is `" "` (two quotes separated by a space). This was not always so and changed in commit 013dfa7. Before 013dfa7 the default behavior was a simple space: ` ` and implemented with relation to ticket MXS-1511.

But the current default behavior leads to wrong quoted queries.

# Executed query

SELECT

  c.id,

  c.name

FROM

  car AS c

WHERE

  c.type = 'porsche'

# with default behavior `" "` as newline replacement

SELECT" "  c.id," "  c.name" "FROM" "  car AS c" "WHERE" "  c.type = 'porsche'

# with previous behavior ` ` as newline replacement

SELECT   c.id,   c.name FROM   car AS c WHERE   c.type = 'porsche'

This seems to be a bug but can be easily prevented by adding newline_replacement=" ".

@markus. I also have a question before I implement this config change. What was the intention of the change in 013dfa7, the behavior before that seemed already the right one. Is there some detail I am missing?