[Qt-creator] Feature request : Persistant doc filter

[bd.anon at free.fr]

Problem : Each time I start QtCreator and want to use the
documentation, which most of the time is a Qt doc request for the
project's current Qt version, I have to manually restate the current
doc filter. This is annoying, as it is rather infrequent to change the
Qt version within the life of any given project.

Request : Make the doc filter setting persistent on a per project
basis. If several projects are loaded, and happen to have conflicting
settings, either use the active project's setting, or better, use the
project's setting associated with the active source page.

Thanks again, trolls, for what is now the best C++ IDE around.