gtk3: avoid empty target clipboard warning

Change-Id: Ic6b46eb2c81398f0ab2e7539e5cdb27a508c8893
(cherry picked from commit 66fedc0966ad0c732cada974ea910d7a98beca15)

1 files changed, 10 insertions, 7 deletions

diff --git a/vcl/unx/gtk3/gtk3gtkinst.cxx b/vcl/unx/gtk3/gtk3gtkinst.cxx
index 9f15db02aa13..e9210d0e128b 100644
--- a/vcl/unx/gtk3/gtk3gtkinst.cxx
+++ b/vcl/unx/gtk3/gtk3gtkinst.cxx
@@ -572,13 +572,16 @@ void VclGtkClipboard::setContents(
             aGtkTargets.push_back(makeGtkTargetEntry(aFlavor));
         }
 
-        //if there was a previous gtk_clipboard_set_with_data call then
-        //ClipboardClearFunc will be called now
-        GtkClipboard* clipboard = gtk_clipboard_get(m_nSelection);
-        //use with_owner with m_pOwner so we can distinguish in handle_owner_change
-        //if we have gained or lost ownership of the clipboard
-        gtk_clipboard_set_with_owner(clipboard, aGtkTargets.data(), aGtkTargets.size(),
-                                    ClipboardGetFunc, ClipboardClearFunc, G_OBJECT(m_pOwner));
+        if (!aGtkTargets.empty())
+        {
+            //if there was a previous gtk_clipboard_set_with_data call then
+            //ClipboardClearFunc will be called now
+            GtkClipboard* clipboard = gtk_clipboard_get(m_nSelection);
+            //use with_owner with m_pOwner so we can distinguish in handle_owner_change
+            //if we have gained or lost ownership of the clipboard
+            gtk_clipboard_set_with_owner(clipboard, aGtkTargets.data(), aGtkTargets.size(),
+                                        ClipboardGetFunc, ClipboardClearFunc, G_OBJECT(m_pOwner));
+        }
         m_aGtkTargets = aGtkTargets;
     }