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This patch adds the concept of a window being "Pinnable" (always drawn
on top of other windows). This can be toggled through a new checkable
action in the top left corner's window menu.
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This also adds the ability to query how many virtual desktops are
set up, and for the Taskbar to be notified when the active virtual
desktop has changed.
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This creates a 2-dimensional array of WindowStack instances, one for
each virtual desktop. The main desktop 0,0 is the main desktop, which
is the desktop used for all stationary windows (e.g. taskbar, desktop).
When adding windows to a desktop, stationary windows are always added
to the main desktop.
When composing the desktop, there are usually two WindowStacks
involved. For stationary windows, the main desktop will be traversed,
and for everything else the current virtual desktop will be iterated.
Iteration is interweaved to preserve the correct order. During the
transition animation, two WindowStacks will be iterated at the same
time.
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We only consider a window "hovered" if its *content area* is hovered.
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This performs a hit test on the window stack to find the window under
a given cursor position.
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A window with an inner stack needs to keep track of which inner window
is active.
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This patch moves the window stack out of WindowManager and into its own
WindowStack class.
A WindowStack is an ordered list of windows with an optional highlight
window. The highlight window mechanism is used during Super+Tab window
switching to temporarily bring a window to the front.
This is mostly mechanical, just moving the code to its own class.
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