dead_caron seems not be working (QTBUG-71678)

[Martin Zbořil]

in Kubuntu 20.04.3, I am unable to type ť, ď, ň, ľ ... other letters with caron without dedicated key or caron itself in any qt based application.

The symbol is common in the Baltic, Slavic, Finnic, Samic and Berber languages. source: https://en.wikipedia.org/wiki/Caron

workaround exists in using gtk based application.

upstream bug exists and was fixed 2 years ago: https://bugreports.qt.io/browse/QTBUG-71678

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: libqt5core5a 5.12.8+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-90.101-generic 5.4.148
Uname: Linux 5.4.0-90-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Sun Nov 21 15:25:13 2021
InstallationDate: Installed on 2018-10-08 (1139 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: qtbase-opensource-src
UpgradeStatus: Upgraded to focal on 2020-10-17 (400 days ago)