This task is about disabling the : sequence in the Reply Tool's visual mode while we determine the ideal behavior, per what @Whatamidoing-WMF suggested in T257709#6310852.

Behavior

1. Visit: https://en.wikipedia.beta.wmflabs.org/wiki/Talk:Cats
2. Open the Reply Tool's visual mode
3. Type :
4. Switch to the tool's source mode

Current behavior

4. ❗️Notice the source mode's text input contains the following: <blockquote></blockquote>

Desired behavior

4. ✅Notice the source mode's text input contains the following: :

Done

• "Desired behavior" is implemented