Introduce new error toast widget

src/meson.build

@@ -51,6 +51,7 @@ warehouse_sources = [
   'main.py',
   'host_info.py',
   'widgets/app_row.py',
+  'widgets/error_toast.py',
   'main_window/window.py',
   'packages_page/packages_page.py',
   '../data/style.css',

src/widgets/error_toast.py

@@ -0,0 +1,24 @@
+from gi.repository import Adw, Gtk, Gdk, GLib, Pango
+clipboard = Gdk.Display.get_default().get_clipboard()
+
+class ErrorToast:
+    def __init__(self, display_msg, error_msg, parent_window, format=True):
+
+        def on_response(dialog, response_id):
+            if response_id == "copy":
+                clipboard.set(error_msg)
+
+        popup = Adw.AlertDialog.new(display_msg, None if format else error_msg)
+        popup.add_response("copy", _("Copy"))
+        popup.add_response("ok", _("OK"))
+        popup.connect("response", on_response)
+
+        if format:
+            lb = Gtk.Label(selectable=True, wrap=True)#, natural_wrap_mode=Gtk.NaturalWrapMode.WORD)
+            lb.set_markup(f"<tt>{GLib.markup_escape_text(error_msg)}</tt>")
+            # lb.set_label(error_msg)
+            # lb.set_selectable(True)
+            popup.set_extra_child(lb)
+
+        self.toast = Adw.Toast(title=display_msg, button_label=_("Details"))
+        self.toast.connect("button-clicked", lambda *_: popup.present(parent_window))