callbacks be unbound unexpectedly.

[cathcheeno]

Bug

Given two riot tags listen same event and mounted like below.

<div>
  <sample-a />
  <sample-b />
</div>

// A.tag
this.riotxChange('event', () => {
  // callback for A
});

// B.tag
this.riotxChange('event', () => {
  // callback for B
});

The problem is that the callback for B is unbound unexpectedly when tag A is unmounted. This is because the two tags(A and B) share the context of _riotx_change_handlers.

[fkei]

👍