Typing :.: (one ASCII dot between colons) will enter the Unicode
horizontal ellipsis (U+2026: …) instead of the bad :…: (the
requested Unicode character between colons).

Note: the pattern :...: (three ASCII dots between colons) was
originally intended for the horizontal ellipsis, but that
collides with .*... pattern (default in English and in several
other languages, meaning: replace word ending three ASCII dots).

Change-Id: I97632ff81e04ab9e53026da425b82a2541db0eb1