I configured my xkb keyboard in a such way:
key <AE12> { [ dead_circumflex, dead_grave, dead_tilde ] };
...
key <AB10> { [ minus, underscore, dead_belowdot, dead_abovedot ] };
...
When I press AltGr+AE12-AE12-a with both plain xkb and skim I obtain:
ẫ
But when I do AE12-AltGr+AB10+a with plain xkb I get:
ậ
but only
ạ
with skim. The same happens every time when the first dead is without AltGr and the second with.
Is this something you still experience with the latest releases?
scim has moved development to github. Seeing that this ticket is unverified I ask you to kindly open a new ticket at https://github.com/scim-im/scim/issues/ if you are still affected by this bug. Thank you.