new ip

plotter-app/venv/lib/python3.8/site-packages/matplotlib/backends/backend_gtk3cairo.py

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+from contextlib import nullcontext
+
+from .backend_cairo import (  # noqa
+    FigureCanvasCairo, _RendererGTKCairo as RendererGTK3Cairo)
+from .backend_gtk3 import Gtk, FigureCanvasGTK3, _BackendGTK3
+
+
+class FigureCanvasGTK3Cairo(FigureCanvasCairo, FigureCanvasGTK3):
+    def on_draw_event(self, widget, ctx):
+        with (self.toolbar._wait_cursor_for_draw_cm() if self.toolbar
+              else nullcontext()):
+            self._renderer.set_context(ctx)
+            scale = self.device_pixel_ratio
+            # Scale physical drawing to logical size.
+            ctx.scale(1 / scale, 1 / scale)
+            allocation = self.get_allocation()
+            Gtk.render_background(
+                self.get_style_context(), ctx,
+                allocation.x, allocation.y,
+                allocation.width, allocation.height)
+            self._renderer.dpi = self.figure.dpi
+            self.figure.draw(self._renderer)
+
+
+@_BackendGTK3.export
+class _BackendGTK3Cairo(_BackendGTK3):
+    FigureCanvas = FigureCanvasGTK3Cairo