some new features

.venv/lib/python3.12/site-packages/matplotlib/backends/backend_gtk4cairo.py

@@ -0,0 +1,32 @@
+from contextlib import nullcontext
+
+from .backend_cairo import FigureCanvasCairo
+from .backend_gtk4 import GLib, Gtk, FigureCanvasGTK4, _BackendGTK4
+
+
+class FigureCanvasGTK4Cairo(FigureCanvasCairo, FigureCanvasGTK4):
+    def _set_device_pixel_ratio(self, ratio):
+        # Cairo in GTK4 always uses logical pixels, so we don't need to do anything for
+        # changes to the device pixel ratio.
+        return False
+
+    def on_draw_event(self, widget, ctx):
+        if self._idle_draw_id:
+            GLib.source_remove(self._idle_draw_id)
+            self._idle_draw_id = 0
+            self.draw()
+
+        with (self.toolbar._wait_cursor_for_draw_cm() if self.toolbar
+              else nullcontext()):
+            self._renderer.set_context(ctx)
+            allocation = self.get_allocation()
+            Gtk.render_background(
+                self.get_style_context(), ctx,
+                allocation.x, allocation.y,
+                allocation.width, allocation.height)
+            self.figure.draw(self._renderer)
+
+
+@_BackendGTK4.export
+class _BackendGTK4Cairo(_BackendGTK4):
+    FigureCanvas = FigureCanvasGTK4Cairo