Moved contacts box preparing to single place.

Telegram/SourceFiles/boxes/peer_list_controllers.cpp

@@ -19,6 +19,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_histories.h"
 #include "apiwrap.h"
 #include "mainwidget.h"
+#include "mainwindow.h"
 #include "lang/lang_keys.h"
 #include "history/history.h"
 #include "dialogs/dialogs_main_list.h"
@@ -104,6 +105,20 @@ void AddBotToGroup(not_null<UserData*> bot, not_null<PeerData*> chat) {
 //	return mapFromGlobal(QCursor::pos()) - _st.rippleAreaPosition;
 //}
 
+object_ptr<Ui::BoxContent> PrepareContactsBox(
+		not_null<Window::SessionController*> sessionController) {
+	const auto controller = sessionController;
+	auto delegate = [=](not_null<PeerListBox*> box) {
+		box->addButton(tr::lng_close(), [=] { box->closeBox(); });
+		box->addLeftButton(
+			tr::lng_profile_add_contact(),
+			[=] { controller->widget()->onShowAddContact(); });
+	};
+	return Box<PeerListBox>(
+		std::make_unique<ContactsBoxController>(controller),
+		std::move(delegate));
+}
+
 void PeerListRowWithLink::setActionLink(const QString &action) {
 	_action = action;
 	refreshActionLink();