wmp: Added DoVerb(OLEIVERB_HIDE) implementation.

dlls/wmp/oleobj.c

@@ -396,6 +396,16 @@ static HRESULT WINAPI OleObject_DoVerb(IOleObject *iface, LONG iVerb, LPMSG lpms
     case OLEIVERB_INPLACEACTIVATE:
         TRACE("(%p)->(OLEIVERB_INPLACEACTIVATE)\n", This);
         return activate_inplace(This);
+
+    case OLEIVERB_HIDE:
+        if(!This->hwnd) {
+            FIXME("No window to hide\n");
+            return E_UNEXPECTED;
+        }
+
+        ShowWindow(This->hwnd, SW_HIDE);
+        return S_OK;
+
     default:
         FIXME("Unsupported iVerb %d\n", iVerb);
     }

dlls/wmp/tests/oleobj.c

@@ -926,6 +926,10 @@ static void test_wmp(void)
 
     test_window(hwnd);
 
+    hres = IOleObject_DoVerb(oleobj, OLEIVERB_HIDE, NULL, &ClientSite, 0, container_hwnd, &pos);
+    ok(hres == S_OK, "DoVerb failed: %08x\n", hres);
+    ok(!IsWindowVisible(hwnd), "Window is visible\n");
+
     SET_EXPECT(OnShowWindow_FALSE);
     SET_EXPECT(OnInPlaceDeactivate);
     hres = IOleObject_Close(oleobj, 0);