Hi to all!

I need to implement custom separator with custom width between two part of 
paragraph in text view:

AAAA AA A      BBB BBBBB B

This is separator must be included as non-editable character. So user can't 
delete it or modify.
I understand, that i must overload standard behavior of textview in some points 
(for example, when user press "delete" right after separator nothing will be 
deleted)

I have several ideas how accomplish this task:

1. Use elastic glyph attribute (there are mentions in documentation about it). 
But I can't find any documentation about how to use it.

2. Use tab symbol and NSTextTab for each paragraph, and in any modification to 
the paragraph recalculate position of tab.

I will be very grateful for any right direction.

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