[polari] urlPreview: Explicitly load pixbuf

[Marge Bot <marge-bot src gnome org>]

commit 4e52e1e6f8e156a30db52d767c98efaeb2402e99
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Aug 25 00:32:25 2021 +0200

    urlPreview: Explicitly load pixbuf
    
    We currently let GtkImage load the thumbnail file, then access its
    :pixbuf property to look up the tEXt::Title attribute.
    
    In GTK4 GtkImage is no longer backed by a pixbuf, so this will stop
    working. Instead, load the pixbuf and set the image from that.
    
    Part-of: <https://gitlab.gnome.org/GNOME/polari/-/merge_requests/225>

 src/urlPreview.js | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/src/urlPreview.js b/src/urlPreview.js
index a673f519..328d3f03 100644
--- a/src/urlPreview.js
+++ b/src/urlPreview.js
@@ -1,3 +1,4 @@
+import GdkPixbuf from 'gi://GdkPixbuf';
 import Gio from 'gi://Gio';
 import GLib from 'gi://GLib';
 import GObject from 'gi://GObject';
@@ -157,9 +158,13 @@ export default GObject.registerClass({
         });
         const thumbnailer = Thumbnailer.getDefault();
 
+        let title;
         try {
             const filename = await thumbnailer.getThumbnail(this.uri);
-            this._image.set_from_file(filename);
+            const pixbuf = GdkPixbuf.Pixbuf.new_from_file(filename);
+
+            title = pixbuf.get_option('tEXt::Title');
+            this._image.set_from_pixbuf(pixbuf);
             this._image.get_style_context().remove_class('dim-label');
         } catch (e) {
             if (e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.NETWORK_UNREACHABLE)) {
@@ -174,10 +179,6 @@ export default GObject.registerClass({
             });
         }
 
-        let title = null;
-        if (this._image.pixbuf)
-            title = this._image.pixbuf.get_option('tEXt::Title');
-
         if (title) {
             this._label.set_label(title);
             this.tooltip_text = title;