Code review comment for lp://staging/~attente/indicator-keyboard/1291962

IBus won't be broken, but we want to prevent this version of indicator-keyboard to be unpacked if the IBus on the user's system doesn't have the patch introduced by 1.5.5-1ubuntu3. I think that's what the Breaks relationship does based on https://www.debian.org/doc/debian-policy/ch-relationships.html#s-breaks.