fix occluded windows

applications/gui2/src/screen.cpp

@@ -127,6 +127,10 @@ void Screen::setView(ftl::gui2::View *view) {
 	view->setTheme(themes_["windowtheme"]);
 	view->setVisible(true);
 
+	if (childIndex(view) == -1) {
+		addChild(view);
+	}
+
 	if (active_view_) {
 		active_view_->setVisible(false);
 
@@ -141,6 +145,10 @@ void Screen::setView(ftl::gui2::View *view) {
 		removeChild(active_view_);
 	}
 
+	// all windows should be in front of new view
+	mChildren.erase(std::remove(mChildren.begin(), mChildren.end(), view), mChildren.end());
+	mChildren.insert(mChildren.begin(), view);
+
 	active_view_ = view;
 	LOG(INFO) << "number of children (Screen): "<< mChildren.size();
 	performLayout();