(Miklos Vajna in bug 157566 comment 7 and 9)
> Note that an easy way to test RTF paste problems is the
> SW_DEBUG_RTF_PASTE_FROM environment variable, it allows specifying a path
> and then if you ctrl-shift-v (paste special) into an empty Writer document,
> we'll read from that file on paste, not from the system clipboard. That's
> handy when trying to fix bugs like this.
> 1) start up Writer
>   [with e.g. `SW_DEBUG_RTF_PASTE_FROM=/path/to/test.rtf soffice --writer`]
> 2) type a character so you have something to cut
> 3) select the character
> 4) cut it with e.g. ctrl-x
> 5) ctrl-shift-v, now you can select rtf