lfottaviano/emesene — comment on commit 7327caab257f156e8b4619708f84b2277083cb91
File: emesene/gui/gtkui/ConversationToolbar.py line 50
By lfottaviano:

so the name should be something like "keep_block_button" "sensitive_block_button" "enable_block_button", because you cant disable it alone, to disable block button you must disable all.