[FancyZones] Fix handling newly created windows on Windows 11 (#28646)

src/modules/fancyzones/FancyZonesLib/FancyZonesWindowProcessing.cpp

@@ -0,0 +1,56 @@
+#include "pch.h"
+#include "FancyZonesWindowProcessing.h"
+
+#include <FancyZonesLib/Settings.h>
+#include <FancyZonesLib/VirtualDesktop.h>
+#include <FancyZonesLib/WindowUtils.h>
+
+bool FancyZonesWindowProcessing::IsProcessable(HWND window) noexcept
+{
+    const bool isSplashScreen = FancyZonesWindowUtils::IsSplashScreen(window);
+    if (isSplashScreen)
+    {
+        return false;
+    }
+
+    const bool windowMinimized = IsIconic(window);
+    if (windowMinimized)
+    {
+        return false;
+    }
+
+    const bool standard = FancyZonesWindowUtils::IsStandardWindow(window);
+    if (!standard)
+    {
+        return false;
+    }
+
+    // popup could be the window we don't want to snap: start menu, notification popup, tray window, etc.
+    // also, popup could be the windows we want to snap disregarding the "allowSnapPopupWindows" setting, e.g. Telegram
+    bool isPopup = FancyZonesWindowUtils::IsPopupWindow(window) && !FancyZonesWindowUtils::HasThickFrameAndMinimizeMaximizeButtons(window);
+    if (isPopup && !FancyZonesSettings::settings().allowSnapPopupWindows)
+    {
+        return false;
+    }
+
+    // allow child windows
+    auto hasOwner = FancyZonesWindowUtils::HasVisibleOwner(window);
+    if (hasOwner && !FancyZonesSettings::settings().allowSnapChildWindows)
+    {
+        return false;
+    }
+
+    if (FancyZonesWindowUtils::IsExcluded(window))
+    {
+        return false;
+    }
+
+    // Switch between virtual desktops results with posting same windows messages that also indicate
+    // creation of new window. We need to check if window being processed is on currently active desktop.
+    if (!VirtualDesktop::instance().IsWindowOnCurrentDesktop(window))
+    {
+        return false;
+    }
+
+    return true;
+}