The SLASH_TRIGGER_RE regex used (?:^|[\s]) as its left anchor, so typing
a / anywhere in the message (e.g. "hello /") opened the slash command
popover — even though slash commands only execute at the beginning of a
message. Anchor the regex strictly at position 0 (^) so the popover only
appears when / is the first character, matching the actual execution
semantics. The @-mention trigger is left untouched since those work
anywhere in the text.
ethernet
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