[Opera] Error thrown when destroying inline editor with simultaneous click

[Piotrek Koszuliński]

Add this button to the inlineall sample:

<button onclick="CKEDITOR.instances.editor1.destroy()">destroy</button>

Click it. Editor is destroyed but error is thrown in selection.js:15.

This is a similar issue to #10219, but it has a different reason.

Possible solution: adding !sel || to the if statement.

[Piotrek Koszuliński]

I thought about TC that should be possible to implement by code.

editor.focus();
someInput.focus();
editor.destroy();

That may trigger the same issues as clicking a button.

[Piotrek Koszuliński]

We dropped Opera <15 support.