Integrated fixes from 1.0 branch.

lib/platform/CMSWindowsClipboard.cpp

@@ -43,7 +43,7 @@ CMSWindowsClipboard::~CMSWindowsClipboard()
 }
 
 bool
-CMSWindowsClipboard::empty()
+CMSWindowsClipboard::emptyUnowned()
 {
 	LOG((CLOG_DEBUG "empty clipboard"));
 
@@ -53,6 +53,16 @@ CMSWindowsClipboard::empty()
 		return false;
 	}
 
+	return true;
+}
+
+bool
+CMSWindowsClipboard::empty()
+{
+	if (!emptyUnowned()) {
+		return false;
+	}
+
 	// mark clipboard as being owned by synergy
 	HGLOBAL data = GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE, 1);
 	SetClipboardData(getOwnershipFormat(), data);