From [1]
What's this?
This is a set of git repositories based on the last public
commits available for Qt 5.15 branches with a curated collection
of patches on top to ensure open source products can be used
comfortably until users transition to their Qt 6-based ports.
Which patches does it include?
This collection of patches includes patches that fix at least
one of the following:
* Security issues
* Crashes
* Functional defects
We only include patches that have been approved upstream in the
Qt project. If a patch cannot be merged upstream for technical
reasons (e.g. the class no longer exists), it can also be
merged.
The patches to merge will be decided based on their relevance
towards Open Source products and their viability.
[1] https://community.kde.org/Qt5PatchCollection