Comment 2 for bug 1570340

Thanks for all the information; Re 1) I have added to the file 'default.keytab' (after saving a copy of the original) the following lines for a first test:

# added by <email address hidden> for Spanish tilded chars
#
key A -Alt-Shift : "a"
key A -Alt+Shift : "A"
key A +Alt-Shift : "\xc3\xa1"
key A +Alt+Shift : "\xc3\x81"

and this gives with the Alt + a key or Alt+Schift+a keys together the chars: á and Á, as expected. Of course this will not work, for example, in Mir and Gedit, because the Alt key is a Menu key there;