lines ending by a double quote get a trailing space added in pre blocks
The above was not entered with a trailing space yet the pre block processing added one.
Oddly, no extra trailing space added for those:
foo="bar" # comment test=ok
So something special happens when a " ends a line.
Reproduced on Redmine 3.0.4 with Firefox 39 and Chrome 43. This was observed long ago so it's not a regression recently introduced.