The chatter composer extends the basic composer to, among other things, add
a button to open the full composer next to the button to add an attachment.
In a recent commit, the basic composer template has been slightly changed and
the buttons have been extracted in a sub-template, which seems to break the
template inheritance (the xpath refers to one of those buttons).
This solution simply removes the sub-template and duplicates the code.
Aaron Bohy
c4240b547f