From 167fd07e010e25feb7ff195706bf91d7c70d1273 Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Wed, 8 Apr 2020 13:37:19 +0200
Subject: [PATCH] x11: Forward current selection state when initializing X11
 selections

Most visible with xwayland-on-demand, at the time of setting things up
for X11 selections, we don't forward the current state. This makes the
first started X11 app oblivious to eg. the current clipboard.

Syncing selections up at the time of initializing the X11 selection
stuff ensures that doesn't happen.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1186
---
 src/x11/meta-x11-selection.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/src/x11/meta-x11-selection.c b/src/x11/meta-x11-selection.c
index a93fa1585..24a075b58 100644
--- a/src/x11/meta-x11-selection.c
+++ b/src/x11/meta-x11-selection.c
@@ -23,6 +23,7 @@
 
 #include <gdk/gdkx.h>
 
+#include "core/meta-selection-private.h"
 #include "x11/meta-selection-source-x11-private.h"
 #include "x11/meta-x11-selection-output-stream-private.h"
 #include "x11/meta-x11-selection-private.h"
@@ -374,10 +375,9 @@ meta_x11_selection_handle_event (MetaX11Display *x11_display,
 }
 
 static void
-owner_changed_cb (MetaSelection       *selection,
-                  MetaSelectionType    selection_type,
-                  MetaSelectionSource *new_owner,
-                  MetaX11Display      *x11_display)
+notify_selection_owner (MetaX11Display      *x11_display,
+                        MetaSelectionType    selection_type,
+                        MetaSelectionSource *new_owner)
 {
   Display *xdisplay = x11_display->xdisplay;
 
@@ -404,6 +404,7 @@ meta_x11_selection_init (MetaX11Display *x11_display)
 {
   XSetWindowAttributes attributes = { 0 };
   MetaDisplay *display = meta_get_display ();
+  MetaSelection *selection;
   guint mask, i;
 
   attributes.event_mask = PropertyChangeMask | SubstructureNotifyMask;
@@ -424,18 +425,24 @@ meta_x11_selection_init (MetaX11Display *x11_display)
     XFixesSelectionWindowDestroyNotifyMask |
     XFixesSelectionClientCloseNotifyMask;
 
+  selection = meta_display_get_selection (display);
+
   for (i = 0; i < META_N_SELECTION_TYPES; i++)
     {
+      MetaSelectionSource *owner;
+
       XFixesSelectSelectionInput (x11_display->xdisplay,
                                   x11_display->selection.xwindow,
                                   selection_to_atom (i, x11_display->xdisplay),
                                   mask);
+      owner = meta_selection_get_current_owner (selection, i);
+      notify_selection_owner (x11_display, i, owner);
     }
 
-  g_signal_connect (meta_display_get_selection (display),
-                    "owner-changed",
-                    G_CALLBACK (owner_changed_cb),
-                    x11_display);
+  g_signal_connect_swapped (selection,
+                            "owner-changed",
+                            G_CALLBACK (notify_selection_owner),
+                            x11_display);
 }
 
 void
@@ -445,7 +452,7 @@ meta_x11_selection_shutdown (MetaX11Display *x11_display)
   guint i;
 
   g_signal_handlers_disconnect_by_func (meta_display_get_selection (display),
-                                        owner_changed_cb,
+                                        notify_selection_owner,
                                         x11_display);
 
   for (i = 0; i < META_N_SELECTION_TYPES; i++)