Windows QPA: Work around intermittent clipboard copy failures

Repeatedly attempt to open the clipboard in case it is opened
by other applications.

Task-number: QTBUG-27097
Change-Id: Ic1cfec0bb17e34f8c7f744add21a4431dae4f5b7
Reviewed-by: Andy Shaw <andy.shaw@qt.io>

1 files changed, 10 insertions, 1 deletions

diff --git a/src/plugins/platforms/windows/qwindowsclipboard.cpp b/src/plugins/platforms/windows/qwindowsclipboard.cpp
index 53f329422c..8b386da9f7 100644
--- a/src/plugins/platforms/windows/qwindowsclipboard.cpp
+++ b/src/plugins/platforms/windows/qwindowsclipboard.cpp
@@ -50,6 +50,7 @@
 #include <QtCore/qdebug.h>
 #include <QtCore/qmimedata.h>
 #include <QtCore/qstringlist.h>
+#include <QtCore/qthread.h>
 #include <QtCore/qvariant.h>
 #include <QtCore/qurl.h>
 
@@ -318,7 +319,15 @@ void QWindowsClipboard::setMimeData(QMimeData *mimeData, QClipboard::Mode mode)
             m_data = new QWindowsOleDataObject(mimeData);
     }
 
-    const HRESULT src = OleSetClipboard(m_data);
+    HRESULT src = S_FALSE;
+    int attempts = 0;
+    for (; attempts < 3; ++attempts) {
+        src = OleSetClipboard(m_data);
+        if (src != CLIPBRD_E_CANT_OPEN || QWindowsContext::isSessionLocked())
+            break;
+        QThread::msleep(100);
+    }
+
     if (src != S_OK) {
         QString mimeDataFormats = mimeData ?
             mimeData->formats().join(QLatin1String(", ")) : QString(QStringLiteral("NULL"));