"Selected text" as an optionally sent field for context menu commands

[Ernest314]

If the user has highlighted a section of text and used a context menu command on it, having that information exposed to the bot could be useful. My current use case is for a database-search bot, and it would be very natural (and obviate the need for message intents) if a user could simply highlight a search term in somebody's post, and ask the bot to run a query on that.

This seems like a natural functionality to give to context menus, and it mirrors how context menus traditionally work across other applications.