Focus issues when scrolled down in IE10+

[magus]

#221

This issue above still seems to be present in IE10+, you can easily reproduce it on the http://quilljs.com/ homepage examples.

Perhaps we can do a fix similar to the pasting scroll issue (#143) and just quickly scroll back to the selected content. Calling preventDefault for the buttons will work just fine for the buttons, but not the select items due to their unique nature.

[jhchen]

I'm not able to reproduce this in IE10 or IE11. Can you post steps for reproduction?

[magus]

Go to quilljs.com
Scroll down to bottom of text editor
Type in some content, select it, then click the bold formatting button or select a new font from the dropdown
The view will jump back to the top (due to the focus call?)

[muhleder]

We're seeing this as well, using something like this to fix it.
muhleder@ca9cd7b

[Pavek]

I can still reproduce it with Quill 0.20.1 on Win7/IE11.

The simplest testcase:
Go to http://quilljs.com/ in IE11
Scroll editor area down to bottom
Click any button: Bold/Italic etc..
=> The editor area is immediately scrolled to the top (this is bad because you might have edited something at the bottom, obviously)

Looks like this is caused by: https://github.com/quilljs/quill/blame/0.20.1/src/modules/toolbar.coffee#L59