irstv/orbisgis — pull request #198 by agueganno (2012-10-20 17:33:25+00:00)
Title: As described in #197, when removing the last letter of a filter, nothing...

... happened.

Indeed, when deciding if we had to fire an event or not, we were using
the empty string as the old value in any situations. Consequently, when
the new string is empty string while the old one is not, we fail. That
should be fixed now, as we use the actual old value when calling
firePropertyChange.