Fullscreen clients no longer hide message boxes

The old solution may have worked at one point in time, but it was kind of
suspect in that it would (theoretically) hide the game window forever. The
new solution will only hide the game window while the message box is
alive. As a bonus, the part where we hide the full screen window now
works.

Sources/Plasma/CoreLib/HeadSpin.cpp

@@ -175,23 +175,6 @@ void DebugMsg(const char fmt[], ...)
     }
 }
 
-void ErrorMinimizeAppWindow () 
-{
-#ifdef HS_BUILD_FOR_WIN32
-    // If the application's topmost window is a fullscreen
-    // popup window, minimize it before displaying an error
-    HWND appWindow = GetActiveWindow();
-    if ( ((GetWindowLong(appWindow, GWL_STYLE) & WS_POPUP) != 0) )
-        SetWindowPos(
-            appWindow,
-            HWND_NOTOPMOST,
-            0, 0, // position
-            0, 0, // size
-            SWP_HIDEWINDOW | SWP_NOMOVE | SWP_NOSIZE
-        );
-#endif
-}
-
 ///////////////////////////////////////////////////////////////////
 
 

Sources/Plasma/CoreLib/hsUtils.cpp

@@ -70,6 +70,31 @@ char *hsScalarToStr(float s)
     return hsStrBuf;
 }
 
+class hsMinimizeClientGuard
+{
+#ifdef CLIENT
+    hsWindowHndl fWnd;
+
+public:
+    hsMinimizeClientGuard()
+    {
+#ifdef HS_BUILD_FOR_WIN32
+        fWnd = GetActiveWindow();
+        // If the application's topmost window is fullscreen, minimize it before displaying an error
+        if ((GetWindowLong(fWnd, GWL_STYLE) & WS_POPUP) != 0)
+            ShowWindow(fWnd, SW_MINIMIZE);
+#endif // HS_BUILD_FOR_WIN32
+    }
+
+    ~hsMinimizeClientGuard()
+    {
+#ifdef HS_BUILD_FOR_WIN32
+        ShowWindow(fWnd, SW_RESTORE);
+#endif // HS_BUILD_FOR_WIN32
+    }
+#endif // CLIENT
+};
+
 bool hsMessageBox_SuppressPrompts = false;
 
 int hsMessageBoxWithOwner(void * owner, const char message[], const char caption[], int kind, int icon)
@@ -106,9 +131,7 @@ int hsMessageBoxWithOwner(void * owner, const char message[], const char caption
     else
         flags |= MB_ICONERROR;
 
-#ifdef CLIENT
-    ErrorMinimizeAppWindow();
-#endif
+    hsMinimizeClientGuard guard;
     int ans = MessageBox((HWND)owner, message, caption, flags);
 
     switch (ans)
@@ -160,9 +183,7 @@ int hsMessageBoxWithOwner(void * owner, const wchar_t message[], const wchar_t c
     else
         flags |= MB_ICONERROR;
     
-#ifdef CLIENT
-    ErrorMinimizeAppWindow();
-#endif
+    hsMinimizeClientGuard guard;
     int ans = MessageBoxW((HWND)owner, message, caption, flags);
     
     switch (ans)

Sources/Plasma/CoreLib/hsUtils.h

@@ -217,7 +217,6 @@ hsDebugMessageProc hsSetStatusMessageProc(hsDebugMessageProc newProc);
 
 void ErrorEnableGui (bool enabled);
 void ErrorAssert (int line, const char file[], const char fmt[], ...);
-void ErrorMinimizeAppWindow ();
 
 bool DebugIsDebuggerPresent ();
 void DebugBreakIfDebuggerPresent ();