[FancyZones] Window switch shortcut fix (#21426)

* rename Layout -> LayoutData

* simplify zone

* split ZoneSet: Layout

* refactoring

* split ZoneSet: LayoutWindows

* update trace

* split ZoneSet: remove ZoneSet

* fix initialization

* split unit tests

* remove unused

* warning

* nullptr  check

* use current rect

* update work area tests

* use current rect

* simplify

* more meaningful name

* dismiss

* safety checks

* resolve conflicts

* reassign windows after switching vd

* avoid double-processing for window on switching vd

* extend windows fix

* check if window is on current desktop before cycling

* separated extend

* not reinit layout windows

src/modules/fancyzones/FancyZonesLib/LayoutAssignedWindows.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <FancyZonesLib/Zone.h>
+
+class LayoutAssignedWindows
+{
+public:
+    struct ExtendWindowModeData
+    {
+        std::map<HWND, ZoneIndexSet> windowInitialIndexSet;
+        std::map<HWND, ZoneIndex> windowFinalIndex;
+    };
+
+public :
+    LayoutAssignedWindows();
+    ~LayoutAssignedWindows() = default;
+
+    void Assign(HWND window, const ZoneIndexSet& zones);
+    void Extend(HWND window, const ZoneIndexSet& zones);
+    void Dismiss(HWND window);
+
+    ZoneIndexSet GetZoneIndexSetFromWindow(HWND window) const noexcept;
+    bool IsZoneEmpty(ZoneIndex zoneIndex) const noexcept;
+    
+    void CycleWindows(HWND window, bool reverse);
+
+    const std::unique_ptr<ExtendWindowModeData>& ExtendWindowData();
+
+private:
+    std::map<HWND, ZoneIndexSet> m_windowIndexSet{};
+    std::map<ZoneIndexSet, std::vector<HWND>> m_windowsByIndexSets{};
+    std::unique_ptr<ExtendWindowModeData> m_extendData{}; // Needed for ExtendWindowByDirectionAndPosition
+
+    void InsertWindowIntoZone(HWND window, std::optional<size_t> tabSortKeyWithinZone, const ZoneIndexSet& indexSet);
+    HWND GetNextZoneWindow(ZoneIndexSet indexSet, HWND current, bool reverse) noexcept;
+};