editor: fix that saving a file deletes trailing whitespace from second codemirror pane in current line, if it is focused.
editor: fix that saving a file deletes trailing whitespace from second codemirror pane in current line, if it is focused.

tscholl2/smc,sagemathinc/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,DrXyzzy/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc,DrXyzzy/smc,sagemathinc/smc