Don't forget to propagate kwargs from print_svgz to print_svg.

Otherwise metadata gets silently dropped, as well as correct support for
rasterized elements in tight_bbox outputs.  Try e.g.
`plot([0, 1], rasterized=True); savefig("test.svgz")` and note that the
line is drawn incorrectly.

Don't bother with `*args`, which are ignored anyways.

Author: anntzer

lib/matplotlib/backends/backend_svg.py

@@ -1322,7 +1322,7 @@ def print_svg(self, filename, *args, **kwargs):
     def print_svgz(self, filename, *args, **kwargs):
         with cbook.open_file_cm(filename, "wb") as fh, \
                 gzip.GzipFile(mode='w', fileobj=fh) as gzipwriter:
-            return self.print_svg(gzipwriter)
+            return self.print_svg(gzipwriter, **kwargs)
 
     @_check_savefig_extra_args
     @_api.delete_parameter("3.4", "dpi")