falling back to the project base path if no file was found.
Add editor_get_default_selection() from get_default_text() in
search.c, to get the current selection or current word.


git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@2172 ea778897-0a13-0410-b9d1-a72fbfd435f5