#2141 Duplicate text in Structure when section name has a break

[Andreï Victorovitch Kostyrka]

Top of the morning to you, ladies and gentlefolks.

When the argument of a sectioning command (say, \section) contains a new line, the Structure View on the left duplicated the contents of the first line in the displayed section name (see the attachment).

[Jan Sundermeyer]

fixed in repository