This is a shell command run with
:silent! !okular [..] in the
Tex_ForwardSearchLaTeX() function (
It looks like
okular is printing some text to stdout or stderr – the
silent! command only silences Vim
:echoerr messages, not stdout from external programs.
To fix this you'll need to add something like
>/dev/null 2>&1 to the end of the shell command. As far as I can see this plugin provides no such facility, but you could modify the source yourself. For example change:
to something like:
execute execString . '>/ dev/null 2>&1'
You can also consider writing to the maintainer (listed at the top of
:help latex-suite.txt) of the plugin to implement this as an option.