As I said earlier on IRC here is a patch that makes the calculator mode in
the window title be separated by a dash instead of it beeing enclosed in
square brackets.

The only change I made is to use the format string "%s- %s" instead of "%s
[%s]" at the two places that I found where the window title is changed (I
tried to make sure that these are all the places that exist).  I didn't
insert any space between the %s and the dash because the value of
v->tool_label that's used to replace that %s seems to always already
contain a space as the last character.