KDE Now Maintaining Their Own Set of Patches For Qt 5
KDE today announced their Qt 5 Patch Collection as the patch-set they will be maintaining to provide security fixes, crash fixes, and other functional defects atop the Qt5 code-base, in particular Qt 5.15 LTS. This isn't being described as a fork but rather just a set of patches that can be applied atop the open-source Qt 5 tool-kit until KDE has managed to move to Qt 6.
There was a brief announcement today of the KDE Qt 5 Patch Collection. The Qt 5 Patch Collection is being organized on their Wiki. KDE is maintaining a Git repository with their patches against the Qt5 base.