File 0001-XCB-Fix-clipboard-breaking-when-timer-wraps-after-50days.patch of Package libqt5-qtbase.18762

From 036fe49580d7470eeaa4c168845bdf2483946f22 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Turek?= <lukas@turek.eu>
Date: Fri, 22 Feb 2019 19:26:37 +0100
Subject: [PATCH] XCB: Fix clipboard breaking when timer wraps after 50 days

xcb_timestamp_t is a 32-bit unsigned value in miliseconds, so it
wraps after 49.7 days. When it happens, QXcbConnection::m_time stops
updating and copy & paste in an application would not work until the
application is restarted. This patch detects the timer wrap and
allows m_time to wrap too. The fix was verified in KDE desktop with
applications running for 51 days.

Fixes: QTBUG-65145
Change-Id: I328c4179c1b1f71914adda6f9a0ca3991a7e808e
Reviewed-by: Uli Schlachter <psychon@znc.in>
Reviewed-by: Milian Wolff <milian.wolff@kdab.com>
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
---
 src/plugins/platforms/xcb/qxcbconnection.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/src/plugins/platforms/xcb/qxcbconnection.h
+++ b/src/plugins/platforms/xcb/qxcbconnection.h
@@ -461,10 +461,10 @@ public:
     void addPeekFunc(PeekFunc f);
 
     inline xcb_timestamp_t time() const { return m_time; }
-    inline void setTime(xcb_timestamp_t t) { if (t > m_time) m_time = t; }
+    inline void setTime(xcb_timestamp_t t) { if (timeGreaterThan(t, m_time)) m_time = t; }
 
     inline xcb_timestamp_t netWmUserTime() const { return m_netWmUserTime; }
-    inline void setNetWmUserTime(xcb_timestamp_t t) { if (t > m_netWmUserTime) m_netWmUserTime = t; }
+    inline void setNetWmUserTime(xcb_timestamp_t t) { if (timeGreaterThan(t, m_netWmUserTime)) m_netWmUserTime = t; }
 
     bool hasXFixes() const { return has_xfixes; }
     bool hasXShape() const { return has_shape_extension; }
@@ -562,6 +562,9 @@ private:
     void destroyScreen(QXcbScreen *screen);
     void initializeScreens();
     bool compressEvent(xcb_generic_event_t *event, int currentIndex, QXcbEventArray *eventqueue) const;
+    inline bool timeGreaterThan(xcb_timestamp_t a, xcb_timestamp_t b) const
+    { return static_cast<int32_t>(a - b) > 0 || b == XCB_CURRENT_TIME; }
+
 #if QT_CONFIG(xinput2)
     bool m_xi2Enabled = false;
     int m_xi2Minor = 2;