From d8b1f46715e5fcaf781b76ecbc386cbe31492287 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Mon, 17 Oct 2022 20:28:06 +0400
Subject: [PATCH] Fix MultiSlideTracker for empty widgets list.

---
 ui/wrap/slide_wrap.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ui/wrap/slide_wrap.cpp b/ui/wrap/slide_wrap.cpp
index 1dcd246..15da77b 100644
--- a/ui/wrap/slide_wrap.cpp
+++ b/ui/wrap/slide_wrap.cpp
@@ -151,6 +151,9 @@ void SlideWrap<RpWidget>::wrappedSizeUpdated(QSize size) {
 }
 
 rpl::producer<bool> MultiSlideTracker::atLeastOneShownValue() const {
+	if (_widgets.empty()) {
+		return rpl::single(false);
+	}
 	auto shown = std::vector<rpl::producer<bool>>();
 	shown.reserve(_widgets.size());
 	for (auto &widget : _widgets) {