When editing LaTeX, I use synctex (e.g.: \synctex=1) to be able to jump 
forward to the appropriate line in the pdf viewer and back from the viewer 
to the line in the editor. Under Linux this seems to work currently only 
for very few setups and I got it working with Emacs and Okular.
I wish this feature would be available in Leo. Backward jumping is more 
important than forward: I use this feature heavily while proof-reading the 
PDF: it is just much quicker to shift-click on a line and end up in the 
right line in the source than searching through the sources until one finds 
the right line.
To do so, I would need to be able to tell Okular how to jump into a 
particular source line of a particular file in Leo (via command line). 
Ideally this should not open a new Leo instance, but direct an already open 
Leo to the appropriate line. For Emacs I would enter this line in the 
Okular "Editor" setting: 

emacsclient -a emacs --no-wait +%l %f
 
Is there a way to do this in Leo? It should start Leo only if Leo is not 
open yet, and jump to the line (%l) in the file (%f).

forward-jumping would require to call Okular with the right command line 
parameters. For Emacs these are:

okular --unique %o#src:%n%b

I am not sure what the parameters mean: I copied them from 
http://mathieu.3maisons.org/wordpress/how-to-configure-emacs-and-auctex-to-work-with-a-pdf-viewer#comment-15

- Josef

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