There seems to be a typo in the 'Compose' file of the UTF-8 locale, in the file
/usr/share/X11/locale/en_US.UTF-8/Compose , 'dead_actute' should be 'dead_acute' I believe:
<dead_actute> <j> : "j́" # LATIN SMALL LETTER J U006A with COMBINING ACUTE ACCENT U0301
My system is Arch linux:
% pacman -Qo /usr/share/X11/locale/en_US.UTF-8/Compose
/usr/share/X11/locale/en_US.UTF-8/Compose is owned by libx11 1.6.2-1
This typo is also present in the freedesktop source, in the following file:
One of the effects is to make Qt's 'qmlscene' qml viewer output the following error:
"Qt Warning - invalid keysym: dead_actute"
Thanks. I missed that when I pushed the J́j́ patch. ☹
Fix pushed as 5dcb40f28d59.