Most recently used virtual desktop chain is only used in the context of
TabBox and therefore moved into this namespace. KWin uses one desktop
chain for each activity. This is mapped by having multiple DesktopChains.
In addition there is a DesktopChainManager which contains all those
chains which are identified by a QString.
The manager gets connected to the signals emitted by VirtualDesktopManager
for changes in virtual desktops and to signals related to Activities
emitted by Workspace. This means the manager is rather generic as it does
not depend on any other components.
The ownership for virtual desktops is moved from Workspace into a new
VirtualDesktopManager. The manager is responsible for providing the count
of virtual desktops and keeping track of the currently used virtual
desktop.
All methods related to moving between desktops are also moved from
Workspace to the new manager, though all methods related to Clients on
Virtual Desktops remain in Workspace for the time being. This is to have
the new manager as independent from KWin core as possible.
An rather important change for the handling of virtual desktops is that
the count and the id of a desktop is now an unsinged integer instead of
an integer. The reason for that is that we cannot have a negative count
of desktops as well as it is not possible to be on a desktop with a
negative identifier.
In that regard it is important to remember that a Client can be on a
desktop with a negative identifier. The special value for a Client being
on all desktops is handled by using -1 as a desktop. For the time being
this is not adjusted but instead of comparing the virtual desktop ids one
should prefer to use the convenient methods like isOnDesktop and
isOnAllDesktops. This would allow in future to internally change the
representation for on all desktops.
Escaping is performed in the model instead of the UI as each of the QML
files needed to be fixed and it is likeley that the issue would come up
again. In the model it's hopefully fixed for good.
BUG: 309960
FIXED-IN: 4.9.4
REVIEW: 107431
If the start Client is not part of the focus chain the call to
nextClientFocusChain() cannot return the Client again. So the loop break
condition is never reached and as the focus chain is not empty the call
always returns a not null Client which means KWin is caught in an endless
loop.
This change checks that the starting Client is in the focus chain and if
not the first Client of the focus chain is used.
BUG: 306260
BUG: 306275
FIXED-IN: 4.9.2
So far the first Client to be shown in the list (that is the
currently active window) was inserted as the last client into
the list by prepending it to the list.
This meant that if another Client actually blocks the inclusion
of the currently selected Client (e.g. only one window per app)
the currently active Client never got included in this list.
This change ensures that the recently used model switching has
the starting Client as the first Client in the list and also
simplifies the code.
Stacking order switching mode is not adjusted as it seems rather
broken, like the comment already says.
BUG: 304950
FIXED-IN: 4.9.1
REVIEW: 106139
The recently used mode of TabBox uses the active window as the entrance
into the focus chain. If there is no active window it does not find any
Clients. To solve this issue the ClientModel now uses the first entry
of the focus chain in case there is no active window.
BUG: 305449
FIXED-IN: 4.9.1
REVIEW: 106088
If the ClientModel does not contain any Clients, which can
happen if there is no desktop window, accessing the data of a
ModelIndex returns an invalid QVariant. Because of that it
needs to be ensured that the QVariant is valid before trying to
cast it to a Client Pointer.
BUG: 304620
FIXED-IN: 4.9.1
REVIEW: 105935
