Merge remote-tracking branch 'origin/5.13' into dev

 Conflicts:
	tests/auto/widgets/itemviews/qheaderview/tst_qheaderview.cpp

Added tests/auto/testlib/selftests/expected_crashes_5.txt to work
round the output of the crashes test (which exercises UB, see
QTBUG-73903) being truncated on one test platform.

Change-Id: I9cd3f2639b4e50c3c4513e14629a40bdca8f8273

1 files changed, 14 insertions, 0 deletions

diff --git a/src/plugins/platforms/xcb/qxcbconnection_basic.cpp b/src/plugins/platforms/xcb/qxcbconnection_basic.cpp
index af72285135..9a028e5a7e 100644
--- a/src/plugins/platforms/xcb/qxcbconnection_basic.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection_basic.cpp
@@ -134,6 +134,7 @@ QXcbBasicConnection::QXcbBasicConnection(const char *displayName)
 
     m_setup = xcb_get_setup(m_xcbConnection);
     m_xcbAtom.initialize(m_xcbConnection);
+    m_maximumRequestLength = xcb_get_maximum_request_length(m_xcbConnection);
 
     xcb_extension_t *extensions[] = {
         &xcb_shm_id, &xcb_xfixes_id, &xcb_randr_id, &xcb_shape_id, &xcb_sync_id,
@@ -178,6 +179,14 @@ QXcbBasicConnection::~QXcbBasicConnection()
     }
 }
 
+size_t QXcbBasicConnection::maxRequestDataBytes(size_t requestSize) const
+{
+    if (hasBigRequest())
+        requestSize += 4; // big-request encoding adds 4 bytes
+
+    return m_maximumRequestLength * 4 - requestSize;
+}
+
 xcb_atom_t QXcbBasicConnection::internAtom(const char *name)
 {
     if (!name || *name == 0)
@@ -199,6 +208,11 @@ QByteArray QXcbBasicConnection::atomName(xcb_atom_t atom)
     return QByteArray();
 }
 
+bool QXcbBasicConnection::hasBigRequest() const
+{
+    return m_maximumRequestLength > m_setup->maximum_request_length;
+}
+
 #if QT_CONFIG(xcb_xinput)
 // Starting from the xcb version 1.9.3 struct xcb_ge_event_t has changed:
 // - "pad0" became "extension"