[polari] Adapt to minor clipboard changes

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

commit 03ee8c668f35237fe4645e03e35e488e2097eef0
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Aug 24 18:31:52 2021 +0200

    Adapt to minor clipboard changes
    
    Clipboard handling changed significantly in GTK4, and cannot easily
    be emulated with GTK3 APIs. Some bits and pieces can though, so
    adapt those.
    
    Part-of: <https://gitlab.gnome.org/GNOME/polari/-/merge_requests/228>

 src/chatView.js  | 4 ++--
 src/entryArea.js | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/chatView.js b/src/chatView.js
index cf995732..710dc53d 100644
--- a/src/chatView.js
+++ b/src/chatView.js
@@ -340,8 +340,8 @@ export default GObject.registerClass({
             parameter_type: new GLib.VariantType('s'),
         });
         action.connect('activate', (a, params) => {
-            const clipboard = Gtk.Clipboard.get_default(this.get_display());
-            clipboard.set_text(params.unpack(), -1);
+            const clipboard = this.get_clipboard();
+            clipboard.set(params.unpack());
         });
         this._actionGroup.add_action(action);
 
diff --git a/src/entryArea.js b/src/entryArea.js
index 37bedb4e..b4e1e042 100644
--- a/src/entryArea.js
+++ b/src/entryArea.js
@@ -63,8 +63,8 @@ export const ChatEntry = GObject.registerClass({
             return;
 
         editable.stop_emission_by_name('paste-clipboard');
+        const clipboard = this.get_clipboard();
 
-        let clipboard = Gtk.Clipboard.get_default(this.get_display());
         clipboard.request_uris((cb, uris) => {
             if (uris && uris.length)
                 this.emit('file-pasted', Gio.File.new_for_uri(uris[0]));