Multilayer text possibilities ?

[Pierre MAZIERE <pierre maziere ibph pharma univ-montp1 fr>]

Hello
i'm looking for a way to have multilayer text possibilities with gtk2:
what i try to have is having 3 strings of X characters each, and to
display a superposition of these strings in a text widget; the character
1 of string1 will be displayed on the top of the character1 of string 2.
Moreover, when if i select one or several characters from this display in
order to make a cut/paste i would like to be able to access the 2 strings
seperatly

... am i dreaming ? or is this already existing ? or do i have to dive
into the creation of a new widget ?

thanks for answering

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Pierre MAZIERE