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Update changelog from branch Plasma/5.22 at minor release 5.22.0.

Adapt to per client keymaps

See merge request !99

Wayland windows of Xwayland clients might not have a surface whenever the
window is already or still unhidden through the X11 connection.

On updateKeymap the modifiers were first forwarded and then updated. While this
shouldn't be problematic per se as the modifiers are updated in this function
already, it is counter-intuitive.

The modifiers member variables should be initialized to Qt::NoModifier.

The Wrapland API has changed to taking the keymap as a string, and then
internally creating keymap files for each wl_keyboard. Adapt to that change.
We don't need to create a temporary file anymore, just send the keymap string.

Move most remaining windowing code

See merge request !97

Move code to the relevant namespace.

Move code to the relevant namespace.

Move class to the relevant namespace.

Move files to the relevant folder.

Apply clang-format before moving files to the win folder.

Move files to the relevant folder.

Apply clang-format before moving files to the win folder.

Move files to the relevant folder.

Apply clang-format before moving files to the win folder.

Move classes RootInfo and WinInfo to the relevant namespace.

Move code to the relevant namespace.

Move files to the relevant folder.

Apply clang-format before moving files to win/x11 folder.

We are going to move the Group code to win/x11.

Move files to the relevant folder.

Apply clang-format before moving files to win/x11 folder.

Move files to the relevant folder.

Apply clang-format before moving client_machine files to win/x11.

Move code to the relevant namespace.

Move code syncalarmx11filter to the relevant folder.

Apply clang-format before moving syncalarmx11filter to win/x11.

Move GeometryTip code to the relevant namespace.

Move geometrytip code to the relevant folder.

Apply clang-format before moving code to win/x11.

Move code to the relevant namespace.

Move window_property_notify_x11_filter code to its proper path.

Apply clang-format before moving code to win/x11 folder.

Ignore cache folder (eg, clangd index files).

Fix compilation with clang, fix few memory issues, improve test robustness

See merge request !96

This fixes a clang compiler warning.

The clang compiler does not like to negate flags objects. This can be fixed by
simply negating without constructing a flags object.

The X11 window can be ready for painting and having a surface at different
points in time. For that try-verify when the windows are ready for painting
and in case the surface is not yet available spy on the change.

On destroy of a window the function might be called after the surface resource
has already been destroyed. In that case we must return true and not check
anymore if a buffer exists.