SUMMARY
Hi!

I am from Hungary. We -in Hungary- have double acute accent for u and o like: "ű" and "ő". I am using keyboard layout "Hungarian (102/QWERTY/dot/dead keys" in KDE(Wayland). The deadkey 'compose + :'+'o'/'u' should produce 'ö'/'ü' but it does nothing. However, ' compose + " '+'o'/'u' should produce 'ű'/'ő' (double accented u and o) but it produces 'ö'/'ü' (o and u with umlaut ).

STEPS TO REPRODUCE
1. Use any hungarian keyboard layout with deadkey
2. Try to produce double accented chars with deadkey like őŐ űŰ and you get öÖ üÜ (characters with umlaut)
3. Try to produce characters with umlaut öÖ üÜ! Wonder why it is not working! 

OBSERVED RESULT
Not working. Should be working.

EXPECTED RESULT
öÖ üÜ for 'compose key'+':'+oO|uU and 
őŐ űŰ for 'compose key'+'"'+oO|uU
 

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION