showPreview() was not working as intended; fixed.

The preview text displayed in the previewEdit widget was the text of
the content opened from the wiki, and not the text entered by the user
in the contentEdit widget.

weboob/applications/qwebcontentedit/main_window.py

@@ -78,5 +78,7 @@ self._currentTabChanged)
         print backtrace
 
     def showPreview(self):
-        self.ui.previewEdit.setHtml(self.backend.get_content_preview(self.content))
+        tmp_content = self.content
+        tmp_content.content=unicode(self.ui.contentEdit.toPlainText())
+        self.ui.previewEdit.setHtml(self.backend.get_content_preview(tmp_content))
         return