[LyX/master] Centralize code to markup deleted complex objects (with tikz) in output

[Kornel Benko]

Am Sun, 29 Dec 2019 10:12:40 +0100
schrieb Jürgen Spitzmüller <spitz at lyx.org>:

> Am Samstag, den 28.12.2019, 17:41 +0100 schrieb Enrico Forestieri:
> > After this commit the output of deleted displayed math is partially
> > broken.  
> 
> Should be fixed now.
> 
> Jürgen

Changing some text leads to \lyxdeleted{}{}{old text}\lyxadded{}{}{new text} and
one can use the entries in TOC to navigate.
BUT
changing colour, language, size, ... does not show the same behaviour.

I suppose this is intended?

	Kornel
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