Mentions are affected by mouse hover

Not sure this is something recently changed, but haven't bothered me before so feels like it. The autocomplete on mentions (@xx) is broken when you hover something in the list. So if you're mouse is just positioned in the general vicinity of where the "mention-list" appears, autocompleting mentions doesn't work at all. Tabbing to select what you though you'd filtered down to instead picks what you're currently/previously hovered.

Imo, hovering a name on the list shouldn't affect what 'autocompleting with tab' does at all. If I wanted to pick something in the list with the mouse, I would click it.

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