When mention contains '@' and we start to add another mention but delete it before choosing the popover doesn't close

[MorCohenTipalti]

[samatcodeapprove]

I believe I am running into this same issue: https://github.com/codeapprove/feedback/issues/49

Basically if I type the popover trigger twice in a row (## in my case) then there's a tiny one-pixel popover which remains open and eats the arrow-up/arrow-down key events.

Note: I am using Vue 2!

[samatcodeapprove]

@Akryum to fix the issue I was facing I forked the library and added && this.displayedItems.length > 0 to the handlers for ArrowUp and ArrowDown.