scrollToSelection incorrectly identifies startDOM

[vilius]

scrollToSelection() {
  let startDOM = this.domSelectionRange().focusNode!
  // ...
}

Context

1. Two ProseMirror editor instances on the same page.
2. Instance A and B.
3. Your cursor is on instance B.
4. If instance A calls scrollToSelection

Expected
Instance A DOM node is scrolled to selection

Actual
Instance B DOM node is scrolled to selection

Problem
domSelectionRange().focusNode! resolves to Instance A even if it was called from Instance B.

Proposed Solution
Check if resolved startDOM matches current instance. If not result in noop.

[marijnh]

Indeed, that doesn't look right. Attached patch adds a check.

[vilius]

Indeed, that doesn't look right. Attached patch adds a check.

I'm very impressed by 30 minutes turnaround from filling an issue and a fix landing on master, mind blowing 🤯

Thanks, Marjin!