[nautilus/previewer-track-currently-open-file] nautilus-previewer: Only launch previewer when file URI changes

[Felipe Borges <felipeborges src gnome org>]

commit 805e7aec15c027837c1baf3912b55a635c04b1e0
Author: Felipe Borges <felipeborges gnome org>
Date:   Tue May 25 16:56:09 2021 +0200

    nautilus-previewer: Only launch previewer when file URI changes
    
    There's a race condition for when Nautilus checks for Sushi's
    "Visible" property and decides whether a selection change should
    update the previewed file.
    
    By avoiding calling Sushi when the selected file is the same as
    the last one previewed, we can workaround the race condition.
    
    Fixes #1823

 src/nautilus-previewer.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/src/nautilus-previewer.c b/src/nautilus-previewer.c
index 66074ab93..4ab2e2d02 100644
--- a/src/nautilus-previewer.c
+++ b/src/nautilus-previewer.c
@@ -38,6 +38,7 @@
 #define PREVIEWER_DBUS_PATH "/org/gnome/NautilusPreviewer"
 
 static GDBusProxy *previewer_v2_proxy = NULL;
+static char *current_file_uri = NULL;
 
 static gboolean
 ensure_previewer_v2_proxy (void)
@@ -88,6 +89,16 @@ nautilus_previewer_call_show_file (const gchar *uri,
                                    guint        xid,
                                    gboolean     close_if_already_visible)
 {
+
+    if (current_file_uri != NULL && g_strcmp0 (current_file_uri, uri) == 0)
+    {
+        g_free (current_file_uri);
+        current_file_uri = NULL;
+
+        return;
+    }
+
+    current_file_uri = g_strdup (uri);
     if (!ensure_previewer_v2_proxy ())
     {
         return;