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Xwayland::self() is not used anywhere.

For consistency sake, use the KWIN_SINGLETON macro in order to make the
DataBridge class a singleton.

It is about to be deprecated

See https://phabricator.kde.org/T12177

This can be used to avoid code duplication by installing an effect multiple
times and tweaking behavior slightly based on the returned ID.

Internally it is called `scriptName` but for consistency with other similar
APIs the name `pluginId` is chosen, and returns e.g. `kwin4_effect_maximize`

With the DataBridge being a native event filter, we can further separate
DataBridge-specific and generic Xwayland bits. In particular, we no
longer have to call DataBridge::filterEvent() from the dispatchEvents()
method, whose main purpose is to dispatch X11 events to kwin.

Uses the same code path we use for the mouse and touch, which was added
after the tablet patches.

Never hit that case, but I figured it makes sense to account for the
case now since we have several paths that return nullptr.

Sometimes when a user puts the pen down too fast a TabletPress event will get triggered before a TabletMove event can occur. The app then assumes the user moved the pen very fast to the new position. The old position is there either (0,0), which often triggers the menu, or the last position the app received, which triggers apps like Xournal++ and Krita to paint a line from the old to the new position.

We'd duplicate some \n which made the output more uncomfortable to look
at.

BUG:425157

The main advantage of SPDX license identifiers over the traditional
license headers is that it's more difficult to overlook inappropriate
licenses for kwin, for example GPL 3. We also don't have to copy a
lot of boilerplate text.

In order to create this change, I ran licensedigger -r -c from the
toplevel source directory.

BUG: 420077

- hunk of original commit e8a1f8ec seems was lost during a94be708 merge,
so restoring it again
- add missing check

Original Differential Revision: https://phabricator.kde.org/D28889

Debugging the panel thumbnails I realised that the setPosition calls
didn't have an effect. This is probably not the only way to fix this bug
but does fix the bug.
At the moment it only brings the position from the interface.

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

Right now KWin moves minimized windows to the end of the task switcher's
ordering. However this is a rather confusing and undocumented behavior
that explicitly overrides the user's chosen sort ordering, be it
"Recently used" or "Stacking order". This makes it a hidden magic behavior
of the type that is at risk of being more annoying than useful.

This commit removes the special handling and lets minimized windows live
in the appropriate order in the task switcher.

This spares a redundant xcb_prefetch_extension_data() during startup.

This spares unnecessary looping through all available X11 screens.

There is no point for processing X11 events if the connection has been
shut down due to a fatal error.

When the Xwayland process crashes, we will print a warning message, but
that warning message won't show up anywhere in the terminal because the
current message severity for KWIN_XWL is way too high.

This patch lowers the message severity for the KWIN_XWL logging category
so warning messages can be seen from the terminal.

If the Xwayland process crashes, it will bring down the entire session
together with itself. Obviously, we don't want that. At least, Wayland
clients should survive the crash.

This change refactors relevant X11 parts to handle Xwayland crashes in a
less fatal way.

In order to handle Xwayland crashes better, a pair of start() and stop()
methods had been introduced in the Xwayland class to allow starting and
stopping the Xwayland process at any moment.

If we detect that the Xwayland process has crashed, we will immediately
stop the Xwayland server, which in its turn will deactivate the socket
notifier and destroy all connected X11 clients. Unfortunately, a couple
of subtle changes in X11Client::releaseWindow() and Unmanaged::release()
had to be made to ensure that we are left with a valid state after the
Xwayland server has been stopped.

This method removes a code path that we can never hit and fixes some
minor coding style issues.

The new test verifies that we handle Xwayland crashes gracefully.

On some touch devices the screen edges sometimes don't work because it detects a 0.5px movement up or down, and that cancels the swipe gesture. This patch discards sub-pixel movements for gestures to fix that.

BUG: 423842
BUG: 421212

We cannot fall through to the next case because `reinterpret_cast`ing
incompatible events is dangerous.

The map may be failed, we should check the image map is succeed first.
Signed-off-by: luochaojiang <luochaojiang@uniontech.com>

Removes a bit of code and allows to list the supported
transformations on the same line, which is useful to be able to
grep over the output.

These headers are meant to be used only by platform and scene plugins.