With enabled -Woverloaded-virtual gcc warning (see
http://lists.freedesktop.org/archives/libreoffice/2011-March/009567.html),
canvas exposed a nasty clash between WeakComponentImplHelper::disposing
and XEventListener::disposing. Fixed by overriding *once* in baseclass,
and then calling disambiguated, renamed methods.
2005/10/11 15:40:54 thb 1.1.2.2: #i54170# Corrected license headers
2005/08/19 11:03:07 thb 1.1.2.1: #i53538# Added null canvas. This canvas will do nothing, except log all operations (to stderr, currently, but planned are various targets)