With KDE 4 then dead keys (áíóú ) are not working in GNOME for KDE applications.
I prefer gnome but there are applications in KDE prefer to use such as Quanta and amaork.
Dread keys worked in KDE 3 in GNOME.
Is there hope for this to bee fixed.

See
https://bugs.kde.org/show_bug.cgi?id=180506
Status: UNCONFIRMED

https://bugzilla.redhat.com/show_bug.cgi?id=450414
Status: CLOSED UPSTREAM