evented mixin `one` when not targeting self only triggers one time for multiple events

[brandonocasey]

The evented one function only triggers one time with multiple listener, when the mixin object is not targeting itself.

Evented Mixin on self

let triggered = 0;
let el = new Component();

const listener = () => triggered++;
el.one(['a', 'b'], listener);

el.trigger('a');
// triggered is 1
el.trigger('b');
// triggered is 2

Evented Mixin on other

let triggered = 0;
let el = new Component();
let el2 = new Component();
el.one(el2, ['a', 'b'], listener);

el2.trigger('a');
// triggered is 1
el2.trigger('b');
// triggered is still 1

• The issue is is due to a this.off call that removes all of the event listeners rather than just the one that triggered the listener.
• This issue wasn't caught because a test is incorrect

[stale[bot]]

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