Fix assigment to reduce text selection to first line.

Sonar told me about this _Useless Operation On Immutable_ while I was playing around with the source. I'm not sure I understand the implications entirely, other than that the current code is pointless. The last change was in '07, so maybe the trimming isn't needed at all. Anyway, feel free to just close this as _irrelevant detail_ :-)

ICLA ID: 32120120730115144