I seem to recall this was reported elsewhere, but...

http://forum.openscad.org/file/n11209/console_highlight.jpg
http://forum.openscad.org/file/n11209/console_highlight2.jpg

I have not been able to find what the associated cause is...

maybe due to previously highlighting text for a copy ie drag to select. ???

p.s. I still think DEPRICATED should not trigger the WARNING behaviour, as
it is sooo comon using libraries...

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Try this.

Run fresh OpenSCAD
Open something
create a syntax error (do not save - so it autosaves a backup)
F5 - gets error msg
select any part or all of the first console line (above the error highlight)
& part of the error msg.
F5 again, whole console should be hightlighted
Fix error
F5 whole console highlighted.

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The TPP is no simple “trade agreement.”  Fight it! http://www.ourfairdeal.org/

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Thanks Michael!
See https://github.com/openscad/openscad/issues/1186

-Marius