Allow resize columns smaller than the header

CHANGELOG

@@ -1,3 +1,5 @@
+* Allow resize columns smaller than the header
+
 Version 2.0.0 - 2011-04-26
 * Bug fixes (see mercurial logs for details)
 * Popup form dialog has 3 buttons (close, ok, new)

tryton/gui/window/view_form/view/list_gtk/parser.py

@@ -185,6 +185,7 @@ class ParserTree(ParserInterface):
                 col.width = width
                 if width > 0:
                     col.set_fixed_width(width)
+                col.set_min_width(0)
                 #XXX doesn't work well when resize columns
                 #col.set_expand(True)
                 if (not treeview.sequence