The emu is now paused when minimized.

WM_PAINT is handled when the emu is paused so the screen is still refreshed.
The screen buffer is filled with white upon reset, if you don't like it you can set another color.

desmume/src/GPU.cpp

@@ -319,6 +319,9 @@ void GPU_Reset(GPU *g, u8 l)
 	//DISP_FIFOclear(&g->disp_fifo);
 	memset(GPU_screen, 0, sizeof(GPU_screen));
 	memset(GPU_tempScreen, 0, sizeof(GPU_tempScreen));
+
+	for(int i = 0; i < (256*192*2); i++)
+		((u16*)GPU_screen)[i] = 0x7FFF;
 }
 
 void GPU_DeInit(GPU * gpu)

desmume/src/windows/main.cpp

@@ -1928,8 +1928,29 @@ LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM
 			return 1;
 			//break;
 		case WM_SIZE:
-				GetWndRect(hwnd);
-				return 0;
+			switch(wParam)
+			{
+			case SIZE_MINIMIZED:
+				{
+					NDS_Pause();
+				}
+				break;
+			default:
+				{
+					NDS_UnPause();
+					GetWndRect(hwnd);
+				}
+				break;
+			}
+			return 0;
+		case WM_PAINT:
+			if(paused)
+			{
+				osd->update();
+				Display();
+				osd->clear();
+			}
+			return DefWindowProc(hwnd, message, wParam, lParam);
         case WM_DROPFILES:
              {
                   char filename[MAX_PATH] = "";