[pull] dev from Flow-Launcher:dev

Flow.Launcher.Core/Resource/Internationalization.cs

@@ -59,6 +59,7 @@ public static void InitSystemLanguageCode()
                     string.Equals(languageCode, fullName, StringComparison.OrdinalIgnoreCase))
                 {
                     SystemLanguageCode = languageCode;
+                    return;
                 }
             }
 

Flow.Launcher.Infrastructure/Win32Helper.cs

@@ -292,18 +292,27 @@ public static unsafe bool IsForegroundWindowFullscreen()
                 return appBounds.top < 0 && appBounds.bottom < 0;
             }
 
-            // For desktop (Progman or WorkerW, depends on the system), we have to check
+            // For desktop (Progman or WorkerW, depends on the system),
+            // we have to check for this hierarchy:
+            // Progman/WorkerW -> SHELLDLL_DefView -> SysListView32("FolderView")
             if (windowClass is WINDOW_CLASS_PROGMAN or WINDOW_CLASS_WORKERW)
             {
-                var hWndDesktop = PInvoke.FindWindowEx(hWnd, HWND.Null, "SHELLDLL_DefView", null);
-                hWndDesktop = PInvoke.FindWindowEx(hWndDesktop, HWND.Null, "SysListView32", "FolderView");
-                if (hWndDesktop != HWND.Null)
+                var hWndDefView = PInvoke.FindWindowEx(hWnd, HWND.Null, "SHELLDLL_DefView", null);
+                if (hWndDefView != HWND.Null)
                 {
-                    return false;
+                    var hWndFolderView = PInvoke.FindWindowEx(hWndDefView, HWND.Null, "SysListView32", "FolderView");
+                    if (hWndFolderView != HWND.Null)
+                    {
+                        return false;
+                    }
                 }
             }
 
             var monitorInfo = MonitorInfo.GetNearestDisplayMonitor(hWnd);
+            if (monitorInfo == null)
+            {
+                return false;
+            }
             return (appBounds.bottom - appBounds.top) == monitorInfo.Bounds.Height &&
                    (appBounds.right - appBounds.left) == monitorInfo.Bounds.Width;
         }