Bug#871584: atk_text_get_get() return value incorrect after multbyte character

[Raphaël POITEVIN]

Package:  Firefox
Version: 54.0-2
Tags: a11y upstream
Owner: bugs at hypra.fr
User: bugs at hypra.fr
Usertags: hypra
Forwarded: https://bugzilla.mozilla.org/show_bug.cgi?id=1346535

DESCRIPTION FROM UPSTREAM:

> "Steps to reproduce:
>
> 1. Load data:text/html;charset=utf-8,<div>Hello %F0%9F%92%97 world</div>
>
> 2. Use Accerciser to find the accessible object corresponding with the 
> <div> element.
>
> 3. In the ipython console, type the following:
>
> -----
> text = acc.queryText()
> allText = text.getText(0,-1)
> ["%s %s" % (allText[i], text.getText(i, i+1)) for i in 
> range(len(allText))]
> -----
>
> Expected results: The values would match.
>
> Actual results: The values match only until the multibyte character is 
> reached. It seems like the get text implementation is assuming 
> single-byte chars (see example output below). Also note that 
> performing the same test using the Gedit text editor works as expected.
>
> ['H H',
>  'e e',
>  'l l',
>  'l l',
>  'o o',
>  '   ',
>  '"
>
> -- 
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