FIX Avoid flash on screen

htdocs/core/class/html.formprojet.class.php

@@ -586,7 +586,7 @@ class FormProjets
 			if ($num > 0)
 			{
 				$sellist = '<select class="flat oppstatus'.($morecss?' '.$morecss:'').'" id="'.$htmlname.'" name="'.$htmlname.'">';
-				if ($showempty) $sellist.= '<option value="-1"></option>';
+				if ($showempty) $sellist.= '<option value="-1">&nbsp;</option>';    // Without &nbsp, strange move of screen when switching value
 				if ($showallnone) $sellist.= '<option value="all"'.($preselected == 'all'?' selected="selected"':'').'>--'.$langs->trans("OnlyOpportunitiesShort").'--</option>';
 				if ($showallnone) $sellist.= '<option value="openedopp"'.($preselected == 'openedopp'?' selected="selected"':'').'>--'.$langs->trans("OpenedOpportunitiesShort").'--</option>';
 				if ($showallnone) $sellist.= '<option value="none"'.($preselected == 'none'?' selected="selected"':'').'>--'.$langs->trans("NotAnOpportunityShort").'--</option>';