Exception flood caused by calling nativeSelection.createRange()

[Danil]

Steps to reproduce in Google Chrome, but should be relevant for any browser: Open browser builtin Developer Tools, set "pause on exception" option. You get a series of debugger pauses every time you try to focus on CKEditor.

This issue makes a debugging difficult. Additionally, this is a waist of processor ticks :) .

[Piotrek Koszuliński]

You're right. I never liked those tools.tryThese: ​https://github.com/ckeditor/ckeditor-dev/blob/master/core/selection.js#L1587

Additionally, that shows that on single selection change getSelectedElement is called multiple times - once for every "align" button. This is worth rethinking, because we can anticipate what data may be needed in command#refresh or editor#selectionChange and prepare all these data. It could either happen in "preloaded" selection instance or simply in the event data.