macos: Fix clipboard data size handling

We were using the allocated memory size, not
the amount of data that has been written.

Fixes: #5261

diff --git a/gdk/macos/gdkmacosclipboard.c b/gdk/macos/gdkmacosclipboard.c
index 25f4669efb386943245f1b48de64d83bef12f74f..3a2667c0dfbbceffe883dbfe92b3240b4fea490b 100644 (file)
--- a/gdk/macos/gdkmacosclipboard.c
+++ b/gdk/macos/gdkmacosclipboard.c
@@ -440,7 +440,7 @@ on_data_ready_cb (GObject      *object,
 
       g_output_stream_close (G_OUTPUT_STREAM (wr->stream), NULL, NULL);
 
-      size = g_memory_output_stream_get_size (wr->stream);
+      size = g_memory_output_stream_get_data_size (wr->stream);
       bytes = g_memory_output_stream_steal_data (wr->stream);
       data = [[NSData alloc] initWithBytesNoCopy:bytes
                                           length:size