gui: fix the global orientation changes

This broke at some point, let's fix it again by moving to the drawing and
calling refresh() from there - no need for the DrawingPerspective to call into
the drawing here.

tuhigui/drawing.py

@@ -50,6 +50,7 @@ class Drawing(Gtk.Box):
     def __init__(self, json_data, *args, **kwargs):
         super().__init__()
         self.orientation = Config.instance().orientation
+        Config.instance().connect('notify::orientation', self._on_orientation_changed)
 
         self.json_data = json_data
         self.svg = svg = JsonSvg(json_data, orientation=self.orientation)
@@ -60,6 +61,10 @@ class Drawing(Gtk.Box):
         self.image_svg.set_from_file(svg.filename)
         self.timestamp = svg.timestamp
 
+    def _on_orientation_changed(self, config, pspec):
+        self.orientation = config.orientation
+        self.refresh()
+
     def refresh(self):
         self.svg = svg = JsonSvg(self.json_data, self.orientation)
         self.image_svg.set_from_file(svg.filename)

tuhigui/drawingperspective.py

@@ -63,12 +63,6 @@ class DrawingPerspective(Gtk.Stack):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.known_drawings = []
-        Config.instance().connect('notify::orientation', self._on_orientation_changed)
-
-    def _on_orientation_changed(self, config, pspec):
-        # When the orientation changes, we just re-generate all SVGs. This
-        # isn't something that should happen very often anyway so meh.
-        self.flowbox_drawings.foreach(lambda child: child.get_child().refresh())
 
     def _cache_drawings(self, device, pspec):
         # The config backend filters duplicates anyway, so don't care here