Change Details

Metatask to migrate to Qt6. Steps are: * Migrate to Qt5.12 as minor version if needed because "old" supported distributions has not yet changed to Qt5.15 minimal. * Migrate to Qt5.15 : * integrate https://phabricator.kde.org/T10168 / https://invent.kde.org/education/gcompris/-/merge_requests/78 * to be able to use Version-less CMake targets (see https://www.qt.io/blog/versionless-cmake-targets-qt-5.15 and https://doc.qt.io/qt-6/portingguide.html) * Migrate to Qt6.2.x: POC in branch work/poc/qt6 (started from the calendar_no_qtquick branch to already have Qt Quick Controls2)

Metatask to migrate to Qt6. Steps are: * Migrate to Qt5.12 as minor version if needed because "old" supported distributions has not yet changed to Qt5.15 minimal. * Migrate to Qt5.15 : * integrate https://phabricator.kde.org/T10168 / https://invent.kde.org/education/gcompris/-/merge_requests/78 * to be able to use Version-less CMake targets (see https://www.qt.io/blog/versionless-cmake-targets-qt-5.15 and https://doc.qt.io/qt-6/portingguide.html) * Migrate to Qt6.2.x: POC in branch work/poc/qt6 (started from the calendar_no_qtquick branch to already have QtQuick Controls2)

Metatask to migrate to Qt6. Steps are: * Migrate to Qt5.12 as minor version if needed because "old" supported distributions has not yet changed to Qt5.15 minimal. * Migrate to Qt5.15 : * integrate https://phabricator.kde.org/T10168 / https://invent.kde.org/education/gcompris/-/merge_requests/78 * to be able to use Version-less CMake targets (see https://www.qt.io/blog/versionless-cmake-targets-qt-5.15 and https://doc.qt.io/qt-6/portingguide.html) * Migrate to Qt6.2.x: POC in branch work/poc/qt6 (started from the calendar_no_qtquick branch to already have Qt Quick Controls2)