[gtk] wayland: Fix dnd type negotiation



commit 4b818495cab4caf77f87c05c912ccb6702621092
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Dec 30 21:14:17 2019 -0500

    wayland: Fix dnd type negotiation
    
    We need to call gdk_content_formats_union_serialize_mime_types
    like GdkClipboard does, in order to get mime types that we can
    sent out.

 gdk/wayland/gdkdrag-wayland.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)
---
diff --git a/gdk/wayland/gdkdrag-wayland.c b/gdk/wayland/gdkdrag-wayland.c
index 6da90dca49..cf7e48a251 100644
--- a/gdk/wayland/gdkdrag-wayland.c
+++ b/gdk/wayland/gdkdrag-wayland.c
@@ -340,6 +340,7 @@ gdk_wayland_drag_create_data_source (GdkDrag *drag)
   GdkDisplay *display = gdk_drag_get_display (drag);
   GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (display);
   const char *const *mimetypes;
+  GdkContentFormats *formats;
   gsize i, n_mimetypes;
 
   drag_wayland->data_source = wl_data_device_manager_create_data_source 
(display_wayland->data_device_manager);
@@ -347,11 +348,20 @@ gdk_wayland_drag_create_data_source (GdkDrag *drag)
                                &data_source_listener,
                                drag);
 
-  mimetypes = gdk_content_formats_get_mime_types (gdk_drag_get_formats (drag), &n_mimetypes);
+  formats = gdk_content_formats_ref (gdk_drag_get_formats (drag));
+  formats = gdk_content_formats_union_serialize_mime_types (formats);
+
+  mimetypes = gdk_content_formats_get_mime_types (formats, &n_mimetypes);
+
+  GDK_DISPLAY_NOTE (gdk_drag_get_display (drag), EVENTS,
+            {char *s = g_strjoinv (" ", (char **)mimetypes);
+            g_message ("create data source, mime types=%s", s);
+            g_free (s);});
+
   for (i = 0; i < n_mimetypes; i++)
-    {
-      wl_data_source_offer (drag_wayland->data_source, mimetypes[i]);
-    }
+    wl_data_source_offer (drag_wayland->data_source, mimetypes[i]);
+
+  gdk_content_formats_unref (formats);
 }
 
 GdkDrag *


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