fix: Commands now completable when not starting with / #4846
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Description
Fixes a regression introduced in #4639. When we can't determine the kind of item being tab-completed, we now consider emotes, usernames, and commands.
Fixes #4842
Truthfully I didn't even know you could create a command without a slash 😅
Implementation
This fix was a bit more complicated than I had expected due to the
userCompletionOnlyWithAt
setting. When we can't deduce the kind of item being completed, depending on this setting, we either:To reduce code duplication, I modified
UnifiedSource
to accept a vector of sources to combine instead of being hardcoded to just combine emotes and usernames.