[reledit] Fix reledit icons jumpiness (closes #4106867) Introduce an "invisible" class (copied verbatim from Bootstrap) that only sets the "visibility" property. "display: none" is the reason for the whole jumpiness as it actually detaches the element from the rendered layout. "visibility: hidden" only makes it transparent while keeping its original box properties (width, height, etc).

# -*- coding: utf-8 -*-
# copyright %(year)s %(author)s, all rights reserved.
# contact %(author-web-site)s -- mailto:%(author-email)s
#
%(long-license)s
"""%(distname)s views/forms/actions/components for web ui"""