nvdaHelper displayModel interface implementation of getWindowTextInRe…

…ct: when collecting text from descendant windows, ignore windows that are invisible according to IsWindowVisible. This among other things stops text from other tabs bleeding through when reviewing a particular propertysheet in a multitabbed dialog (e.g. file / folder properties in Windows explorer).

source/NVDAHelper/remote/displayModelRemote.cpp

@@ -35,6 +35,7 @@ error_status_t displayModelRemote_getWindowTextInRect(handle_t bindingHandle, co
 	if(hasDescendantWindows) {
 		tempModel=new displayModel_t;
 		for(deque<HWND>::reverse_iterator i=windowDeque.rbegin();i!=windowDeque.rend();++i) {
+			if(!IsWindowVisible(*i)) continue;
 			displayModelsByWindow.acquire();
 			displayModelsMap_t<HWND>::iterator j=displayModelsByWindow.find(*i);
 			if(j!=displayModelsByWindow.end()) {