Created attachment 154947 [details]
screenshot

SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***


STEPS TO REPRODUCE
1. add ppa to your system:
sudo add-apt-repository ppa:kdenlive/kdenlive-stable
sudo apt update

2. the upgrade can not be done:
Los siguientes paquetes tienen dependencias incumplidas:
 kdenlive : Depende: melt-7 pero no está instalado
E: Dependencias incumplidas. Intente «apt --fix-broken install» sin paquetes (o especifique una solución).

3. kdenlive puts in blank and also cannot resize nor maximize

OBSERVED RESULT
can not upgrade
can not maximize nor resize kdenlive

EXPECTED RESULT
no issues at upgrade
kdenlive could resize

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

ADDITIONAL INFORMATION