Set device pixel ratio when saving a figure

QuLogic · QuLogic · commit 26ab2fc14ee0 · 2021-09-08T23:19:16.000-04:00
Otherwise, `FigureCanvasBase.get_width_height` returns a size scaled
down by the current pixel ratio, even though the DPI is not scaled up.
This causes the saved figure to be cropped.
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -2259,6 +2259,7 @@ def print_figure(
         # Remove the figure manager, if any, to avoid resizing the GUI widget.
         with cbook._setattr_cm(self, manager=None), \
              cbook._setattr_cm(self.figure, dpi=dpi), \
+             cbook._setattr_cm(canvas, _device_pixel_ratio=1), \
              cbook._setattr_cm(canvas, _is_saving=True), \
              ExitStack() as stack:
 
