Plasma/Plasma 6: Difference between revisions

Revision as of 13:41, 14 August 2023

Plasma 6 is built on top of Qt 6 and is tentatively planned to be released in late 2023 or early 2024. This page outlines important information and major changes coming in Plasma 6.

Release date and schedule

Release date is currently undefined, but hopefully between the end of 2023 and the beginning of 2024. See Schedules/Plasma_6 for more information.

Known issues

On the KDE side:

Plasma 6 issues
Frameworks 6 issues + Plasma 6 issues
All Qt6-related issues across all KDE software
In a built-from-source dev session on top of a distro-provided session, KWin effect IDs have changed, so they appear duplicated in the Effects KCM and you need to disable one of each, or else both play at the same thing and there are weird visual glitches.
In a built-from-source dev session on top of a distro-provided session, Qt5-using QML apps don't launch because they'll try to use the KF6 Kirigami. Workaround: For those apps, create custom .desktop files with QML2_IMPORT_PATH set to the built-from-source KF5 location in the "Environment Variables" field, and an absolute path to to the built-from-source executable in the "Program" field. See also https://phabricator.kde.org/T16483.

Upstream:

Deleting network connections doesn't work
- https://bugs.kde.org/show_bug.cgi?id=473012

System Settings crashes nearly constantly when switching pages
- https://bugreports.qt.io/browse/QTBUG-112306
- Fixed in Qt 6.5.3

System Settings crashes when quitting
- https://bugs.kde.org/show_bug.cgi?id=470598
- Fixed in Qt 6.5.3

Plasma and apps crash when dragging anything into another app
- https://bugs.kde.org/show_bug.cgi?id=470925
- Fixed in Qt 6.6

Opening URLs/Links in many apps doesn't work at all
- https://bugs.kde.org/show_bug.cgi?id=472300
- Fixed in xdg-utils, but there's no new release yet

On Wayland, with scaling, QML windows have content drawn at the wrong scale until manually resized
- https://codereview.qt-project.org/c/qt/qtdeclarative/+/447075
- Fixed in Qt 6.5.3

How to use/test it

Developers and adventurous users are encouraged to test or even live on Plasma 6, to help get it into a releasable state faster. Before doing so, remember the rules of Plasma 6:

Read through the list of major bugs and only use Plasma 6 in production of none of them is a deal-breaker for you. Maintain regular backups! This is mandatory.
When you encounter an issue in Plasma 6 that was not present in Plasma 5, check the list of issues to see if it's already been reported. If you don't find anything, submit a bug report and add the "qt6" keyword to it.
If you are technically able, try to fix issues you encounter yourself.

Options for testing Plasma 6 include the following:

Build from source
Fedora KDE - Discussion in #kde:fedoraproject.org on Matrix
KaOS ISO
KaOS Install
KDE Neon Unstable ISO

If you're a distro packager reading this and your distro offers a Plasma 6 ISO/repo/etc, please add it to this list in alphabetical order!

Developer-facing changes

PlasmaComponents 2 has been removed. All usages should be changed to their PlasmaComponents 3 equivalents.
Widget API has changed, and all widgets need to be ported. See the Plasma 6 widget porting guide to learn how.
On Wayland, Plasma panels, sidebars, KRunner, and Yakuake are now positioned using the layer-shell protocol.

User-facing changes

New features

User interface changes

Changes to default settings

Removals

KHotKeys (which provides the "Custom Shortcuts" page in System Settings) - it was unmaintained for over 7 years and its core functionality overlapped the newer, maintained, and better supported KGlobalAccel system
The "Windowed widgets KRunner runner - it was confusing users into thinking that widgets (which are intentionally very small and limited) were apps
The "Grid", "Informative", "Small Icons", "Text Only", and "Thumbnails" Task Switchers - they were worse than other existing ones
The "Force Font DPI" setting on Wayland - the per-screen scaling system is now considered the only supported method of doing systemwide scaling
The ability to configure (some) icon sizes semi-systemwide - It didn't work in more places than it did work, and people were trying unsuccessfully to use it instead of more suitable methods of scaling the system
Per-Activity power settings - they were largely broken, increased code complexity of a fragile part of the system, and were and mostly possible to approximate using other settings
The Air theme - it was unmaintained and somewhat broken
Unsplash Picture of the Day provider - it stopped working after Unsplash revoked public API access due to abuse by AI data model training scrapers
"Windows go above" and "Windows go below" Panel visibility modes - lost for technical reasons, not as a result of an intentional design decision; may return if we can find a way to support these features on Wayland with the layer-shell protocol

Work that's been decided on but not implemented yet

Packaging notes

This section is aimed at packagers/distributors for information about correctly packaging a KF6/Plasma 6 session

Sources

Most of the required sources are not released. For Frameworks and Plasma the development work happens in master branch. Some applications use master for their KF6 development work and support building against Qt5 or Qt6, others have a dedicated kf6 branch. See here for machine-readable information for the right branch.

The following frameworks will not be part of KF6:

kdelibs4support
kdesignerplugin
kdewebkit
kemoticons
khtml
kinit
kjs
kjsembed
kmediaplayer
kross
kxmlrpcclient

The following non-frameworks modules are obsolete:

kross-interpreters
kwebkitpart
khotkeys

The following new frameworks will be part of KF6:

kcolorscheme
ktexttemplate
ksvg

The following new non-frameworks modules are relevant:

kglobalacceld
plasma5support
kmoretools

Coinstallability

For frameworks and other relevant libraries we aim for being able to install both a 5 and a 6 version without conflicts. However there are cases where this cannot be provided out of the box, e.g. because a framework contains runtime parts that must only exist once. Some projects have build flags to disable such problematic parts that should be applied to the KF5 build:

kguiaddons: -DBUILD_GEO_SCHEME_HANDLER=OFF
baloo: -DBUILD_INDEXER_SERVICE=OFF
kglobalaccel: -DBUILD_RUNTIME=OFF

The icon frameworks only include assets. Only the KF6 one should be installed. These are:

breeze-icons
oxygen-icons

Qt5 compatibility

For compatibility with Qt5-based apps (first- and third-party) we need Qt5-based variants of several modules in addition to Qt6-based ones. These modules include:

Breeze/Oxygen, for correct application style. This also applies to third-party QStyles
plasma-integration, for correct Qt integration
kwayland-integration, for several Wayland things to work
kio-extras, for various kio-related things
various kio-* things
various non-Frameworks libraries as needed

Breeze, plasma-integration, and kwayland-integration support building for Qt5 and Qt6 in the same build.

Pending Upstream Changes

Several upstream changes that were necessary are not merged and/or released:

appstream 1.0 is needed for Qt6 support. This means current main branch for now since 1.0 is not released
xdg-utils needed a change to support KDE_SESSION_VERSION=6. A new release is needed
libaccounts-qt and signond need changes for Qt6 support. MRs are pending. Meanwhile a fork of libaccounts-qt and signond can be used
kdsoap Qt5/Qt6 is not fully coinstallable

@@ Line 13: / Line 13: @@
 Upstream:
+* Deleting network connections doesn't work
+** https://bugs.kde.org/show_bug.cgi?id=473012
 * System Settings crashes nearly constantly when switching pages
 ** https://bugreports.qt.io/browse/QTBUG-112306