Certain keys on the Swedish (se) and Danish (dk) keyboards don't work as
expected with the xkb keymaps for those layouts. The problem arises when
one wants to type characters with accents (^"~'`) and has to use dead keys
for this. It doesn't matter if dead_keys is enabled, the problem is in the
keymap.

The problem may affect more than the Swedish and Danish layout. I use the
Swedish layout myself and the problem with the Danish layout was reported
by a Danish user, Birger Langkjer, to the Redhat I18N mailing list.
It is probably a safe bet that this problem also effects the Norwegian (no)
layout, for example, and that the solution should be similar to those
below.

The solutions:

Swedish layout
File: /usr/X11R6/lib/X11/xkb/symbols/se
The lines:
    key <AE12> {        [           acute,           grave      ]       };
    key <AD12> {        [       diaeresis,     asciicircum      ]       };
should be changed to:
    key <AE12> {        [      dead_acute,      dead_grave      ]       };
    key <AD12> {        [  dead_diaeresis, dead_circumflex      ]       };


Danish layout:
File: /usr/X11R6/lib/X11/xkb/symbols/dk
The lines:
    key <AE12> {        [           acute,           grave      ],
                        [             bar,     dead_ogonek      ]       };
    key <AD12> {        [       diaeresis,     asciicircum      ],
                        [      asciitilde,     dead_macron      ]       };
should be changed to:
    key <AE12> {        [      dead_acute,      dead_grave      ],
                        [             bar,     dead_ogonek      ]       };
    key <AD12> {        [  dead_diaeresis, dead_circumflex      ],
                        [      dead_tilde,     dead_macron      ]       };