Compatibility with urwid 5.0

- Scrollable: use Pile.focus instead of Pile.get_focus(), which urwid 5.0 removes.
- ImageScreen: subclass urwid.display.raw.Screen instead of the urwid.raw_display
  path, deprecated since urwid 2.4.0 and to be removed in urwid 7.0.

Both replacements work with urwid 3.0.5, the declared minimum.

nomadnet/ui/textui/images/screen.py

@@ -6,7 +6,7 @@ from ._termlib import is_kitty_supported
 from .widget import ImageWidget
 
 # A raw display screen subclass with Kitty TGP side-channel support
-class ImageScreen(urwid.raw_display.Screen):
+class ImageScreen(urwid.display.raw.Screen):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self._ti_images = {}

nomadnet/vendor/Scrollable.py

@@ -146,7 +146,7 @@ class Scrollable(urwid.WidgetDecoration):
                                     ow.focus = pwi
 
                                     st = None
-                                    nf = ow.get_focus()
+                                    nf = ow.focus
                                     if hasattr(nf, "key_timeout"):
                                         st = nf
                                     elif hasattr(nf, "original_widget"):