From 6635d03818c90f62cfddb516acadc293255b8905 Mon Sep 17 00:00:00 2001
From: Ilya Fedin <fedin-ilja2010@ya.ru>
Date: Sat, 29 Aug 2020 03:55:38 +0400
Subject: [PATCH] Check if xcb-screensaver extension present

---
 .../platform/linux/specific_linux.cpp          | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Telegram/SourceFiles/platform/linux/specific_linux.cpp b/Telegram/SourceFiles/platform/linux/specific_linux.cpp
index a5a827418..fc0638158 100644
--- a/Telegram/SourceFiles/platform/linux/specific_linux.cpp
+++ b/Telegram/SourceFiles/platform/linux/specific_linux.cpp
@@ -324,6 +324,20 @@ std::optional<xcb_atom_t> GetXCBAtom(
 	return atom;
 }
 
+bool IsXCBExtensionPresent(
+		xcb_connection_t *connection,
+		xcb_extension_t *ext) {
+	const auto reply = xcb_get_extension_data(
+		connection,
+		ext);
+
+	if (!reply) {
+		return false;
+	}
+
+	return reply->present;
+}
+
 std::vector<xcb_atom_t> GetXCBWMSupported(xcb_connection_t *connection) {
 	auto netWmAtoms = std::vector<xcb_atom_t>{};
 
@@ -398,6 +412,10 @@ std::optional<crl::time> XCBLastUserInputTime() {
 		return std::nullopt;
 	}
 
+	if (!IsXCBExtensionPresent(connection, &xcb_screensaver_id)) {
+		return std::nullopt;
+	}
+
 	const auto root = static_cast<xcb_window_t>(reinterpret_cast<quintptr>(
 		native->nativeResourceForIntegration(QByteArray("rootwindow"))));