File 005-Flush-pending-clipboard-on-focus-in-event.patch of Package gtk-vnc

Subject: Flush pending clipboard on focus-in event
From: Lin Ma lma@suse.de Mon Jul 7 13:00:46 2025 +0800
Date: Sun Oct 12 16:55:56 2025 +0800:
Git: 6c8d86919878f08665e3c92915c58c64901af3ea

This patch introduces a mechanism to handle clipboard synchronization
when the VNC client window regains focus.

Previously, if a user copied content while the VNC window was inactive,
the clipboard change state 'pendingClientClipboard' was recorded but not
immediately notified to the server.

This commit addresses this by:
- Making VncDisplay listen for the 'focus-in-event' signal.
- When the widget gains focus, the vnc_connection_flush_pending_clipboard
  function is called.
- This function checks for a pending clipboard update and, if one exists,
  immediately sends a NOTIFY message to the server side, announcing that
  clipboard content is available.

This "lazy synchronization" strategy ensures that the clipboard state is
updated only when the user re-engages with the VNC session.

Signed-off-by: Lin Ma <lma@suse.de>

--- a/src/libgvnc_sym.version
+++ b/src/libgvnc_sym.version
@@ -97,6 +97,7 @@
 
 	vnc_connection_handle_clipboard_change;
 	vnc_connection_clear_pending_flag;
+	vnc_connection_flush_pending_clipboard;
 
 	vnc_util_set_debug;
 	vnc_util_get_debug;
--- a/src/vncconnection.c
+++ b/src/vncconnection.c
@@ -6978,3 +6978,12 @@ void vnc_connection_clear_pending_flag(V
 
     priv->pendingClientClipboard = FALSE;
 }
+
+void vnc_connection_flush_pending_clipboard(VncConnection *conn)
+{
+    VncConnectionPrivate *priv = conn->priv;
+
+    if (priv->pendingClientClipboard)
+        vnc_connection_announce_clipboard(conn, TRUE);
+    priv->pendingClientClipboard = FALSE;
+}
--- a/src/vncconnection.h
+++ b/src/vncconnection.h
@@ -248,6 +248,7 @@ gboolean vnc_connection_set_framebuffer(
 
 void vnc_connection_handle_clipboard_change(VncConnection *conn);
 void vnc_connection_clear_pending_flag(VncConnection *conn);
+void vnc_connection_flush_pending_clipboard(VncConnection *conn);
 
 const char *vnc_connection_get_name(VncConnection *conn);
 int vnc_connection_get_width(VncConnection *conn);
--- a/src/vncdisplay.c
+++ b/src/vncdisplay.c
@@ -1876,6 +1876,21 @@ static void on_primary_owner_change(GtkC
                                                      opaque);
 }
 
+static gboolean on_focus_in(GtkWidget *widget G_GNUC_UNUSED,
+                            GdkEventFocus *event G_GNUC_UNUSED,
+                            gpointer opaqueg)
+{
+    VncDisplay *display = VNC_DISPLAY(opaqueg);
+    VncDisplayPrivate *priv = display->priv;
+
+    VNC_DEBUG("VncDisplay gained focus.");
+
+    if (!priv->read_only)
+        vnc_connection_flush_pending_clipboard(priv->conn);
+
+    return FALSE;
+}
+
 static void on_server_cut_text(VncConnection *conn G_GNUC_UNUSED,
                                const gchar *text,
                                gpointer opaque)
@@ -3055,6 +3070,8 @@ static void vnc_display_init(VncDisplay
                      G_CALLBACK(on_power_control_fail), display);
     g_signal_connect(gtk_clipboard_get(GDK_SELECTION_PRIMARY), "owner-change",
                      G_CALLBACK(on_primary_owner_change), display);
+    g_signal_connect(display, "focus-in-event",
+                     G_CALLBACK(on_focus_in), display);
 
     priv->keycode_map = vnc_display_keymap_gdk2rfb_table(&priv->keycode_maplen);
 }