Before this PR, when there was two frames, A and B, if the adder was in
frame A, it was necessary to __double click__ on frame B to remove the
adder and the selection from frame A.

After this PR, __a single click__  on frame B removes the adder and text
selection from frame A. This behaviour is similar to what happens on a
single frame scenario, where a single click removes the adder and the
selection.